Refresh README + dev docs to match current collection layout

- README: add npm run dev:admin to local quickstart; correct the
  src/assets, src/components and src/content trees (drop stale
  testimonials/, add docs/, add admin/, add the five
  *-section-visibility collections, fix testimonials as flat list.mdx);
  move testimonials to the language-neutral list with quoteEn/quoteDe.
- docs/dev/architecture.mdx, docs/dev/content-collections.mdx: document
  the *-section-visibility collections.
- docs/guides/managing-media.mdx: rename the singleton reference to
  "Media categories" (the categories list is now its own per-locale
  singleton).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: leopoldblum

README.md

@@ -26,6 +26,14 @@ npm install
 npm run dev
 ```
 
+Dev server runs at `localhost:4321`. To work on the admin UI locally, use:
+
+```sh
+npm run dev:admin
+```
+
+Then visit `localhost:4321/keystatic` to open the Keystatic editor.
+
 ## Deployment
 
 The repo produces **two separate deploys** from the same source tree. The public pages are pure static HTML/CSS/JS, which GitHub Pages serves for free — but the admin UI's `/keystatic` and `/api/keystatic/*` routes need server-side rendering (OAuth callback + GitHub commit handler), and GitHub Pages doesn't support that. The admin therefore runs on Cloudflare Pages with an SSR adapter, while the public site stays on GitHub Pages.
@@ -77,6 +85,7 @@ The site rebuilds from the previous state within a few minutes. See the [If Some
 │   ├── assets/              # Images organized by content type
 │   │   ├── about-us/        # About page section images (our-mission/)
 │   │   ├── default-images/  # Placeholder/fallback images
+│   │   ├── docs/            # Images embedded in /docs MDX content
 │   │   ├── events/          # Event cover images
 │   │   ├── footer/          # Footer logo variants
 │   │   ├── header/          # Header logo variants
@@ -85,11 +94,11 @@ The site rebuilds from the previous state within a few minutes. See the [If Some
 │   │   ├── projects/        # Project cover images
 │   │   ├── social-icons/    # Social platform icons (per-platform subfolder)
 │   │   ├── sponsors/        # Sponsor logos by tier (diamond/, gold/, etc.)
-│   │   ├── testimonials/    # Testimonial portraits
 │   │   └── whatIsBears/     # "What is BEARS" section images
 │   │
 │   ├── components/          # Astro components
 │   │   ├── about/           # About page sections
+│   │   ├── admin/           # Admin dashboard (admin build only)
 │   │   ├── contact/         # Contact page components
 │   │   ├── docs/            # Documentation page components
 │   │   ├── events/          # Events page components
@@ -103,14 +112,18 @@ The site rebuilds from the previous state within a few minutes. See the [If Some
 │   │   └── sponsors/        # Sponsors page components
 │   │
 │   ├── content/             # Astro content collections
+│   │   ├── about-section-visibility/    # Per-section show/hide toggles (singleton)
 │   │   ├── branding/        # Brand logos, favicon, OG default (singleton)
+│   │   ├── contact-section-visibility/  # Per-section show/hide toggles (singleton)
 │   │   ├── default-images/  # Fallback cover images (singleton)
 │   │   ├── docs/            # Documentation pages (guides/, dev/)
 │   │   ├── events/          # Event entries (.md/.mdx)
 │   │   │   ├── en/          #   English (default)
 │   │   │   └── de/          #   German translations
 │   │   ├── hero-slides/     # Landing page hero carousel slides
 │   │   ├── instagram/       # Instagram feed entries
+│   │   ├── landing-section-visibility/  # Per-section show/hide toggles (singleton)
+│   │   ├── media-section-visibility/    # Per-section show/hide toggles (singleton)
 │   │   ├── page-text/       # Editable page copy by section
 │   │   │   ├── en/          #   English (default)
 │   │   │   │   ├── 404/
@@ -134,9 +147,8 @@ The site rebuilds from the previous state within a few minutes. See the [If Some
 │   │   │   └── de/          #   German translations
 │   │   ├── social-platforms/ # Social platforms (Instagram, LinkedIn, YouTube, …)
 │   │   ├── sponsors/        # Sponsor entries by tier (diamond/, gold/, etc.)
-│   │   ├── testimonials/    # Testimonial entries
-│   │   │   ├── en/          #   English (default)
-│   │   │   └── de/          #   German translations
+│   │   ├── sponsors-section-visibility/ # Per-section show/hide toggles (singleton)
+│   │   ├── testimonials/    # Single list.mdx; quotes inline as quoteEn / quoteDe
 │   │   └── config.ts        # Collection schemas (Zod)
 │   │
 │   ├── keystatic/           # MDX component registry for the Keystatic editor
@@ -170,7 +182,7 @@ The site supports two languages: **English** (default) and **German**.
 - English pages live at the root URL (e.g., `/about-us`)
 - German pages live under `/de/` (e.g., `/de/about-us`)
 
-Localized content collections (`events`, `projects`, `page-text`, `testimonials`) use `en/` and `de/` subfolders. Collections that are language-neutral (`people`, `sponsors`, `instagram`, `hero-slides`) stay flat — `people` keeps role translation inline via `roleEn` / `roleDe`. If a German translation is missing, the English version is shown as fallback.
+Localized content collections (`events`, `projects`, `page-text`) use `en/` and `de/` subfolders. Collections that are language-neutral (`people`, `sponsors`, `instagram`, `hero-slides`, `testimonials`) stay flat — `people` keeps role translation inline via `roleEn` / `roleDe`, and `testimonials` keeps quote translation inline via `quoteEn` / `quoteDe`. If a German translation is missing, the English version is shown as fallback.
 
 The language switcher in the header toggles between locales. Locale utilities live in `src/utils/i18n.ts`.
 

src/content/docs/dev/architecture.mdx

@@ -36,6 +36,8 @@ Content is managed through Astro's content collections, defined in `src/content/
 
 Localized collections (`events`, `projects`, `page-text`) use `en/` and `de/` subfolders. Language-neutral collections (`sponsors`, `instagram`, `hero-slides`, `docs`, `people`, `testimonials`, `social-platforms`) stay flat — `people` carries both role translations inline (`roleEn`/`roleDe`), and `testimonials` carries both quote translations inline (`quoteEn`/`quoteDe`).
 
+A second class of collections — `landing-section-visibility`, `about-section-visibility`, `sponsors-section-visibility`, `contact-section-visibility`, `media-section-visibility` — store per-page section-toggle YAML (`settings.yaml`) rather than rendered content. Pages read them to skip entire sections at render time, and editors flip the toggles through the **\<page\> — segments** singletons in Keystatic.
+
 ## Internationalization (i18n)
 
 The site supports English (default, no URL prefix) and German (`/de/` prefix). Configured via Astro's built-in i18n in `astro.config.mjs`.

src/content/docs/dev/content-collections.mdx

@@ -20,6 +20,7 @@ All website content is managed through [Astro content collections](https://docs.
 | `hero-slides` | `src/content/hero-slides/` | No | order, alt, shownText (corner overlay on homepage hero AND /media caption when surfaced), media (conditional: `{discriminant: image\|video, value}`), displayInMedia |
 | `instagram` | `src/content/instagram/` | No | url, date, isDraft |
 | `docs` | `src/content/docs/` | No | title, description, order, group |
+| `landing-section-visibility`, `about-section-visibility`, `sponsors-section-visibility`, `contact-section-visibility`, `media-section-visibility` | `src/content/<page>-section-visibility/settings.yaml` (one YAML file each) | No | Boolean `show*` toggles per page, edited via the **\<page\> — segments** singletons. Pages read these to skip whole sections at render time. |
 
 **Localized collections** use `en/` and `de/` subfolders with identical filenames in each. Content queries filter by locale and fall back to English if a German translation is missing.
 

src/content/docs/guides/managing-media.mdx

@@ -47,7 +47,7 @@ Each per-image source has a checkbox you can flip off:
 
 Event and project covers always appear on /media — to keep an event/project off the page entirely, mark its `isDraft: true` (which hides it everywhere).
 
-To hide an entire category, edit the **Media — page header + categories** singleton in the admin and remove that category from the `mediaCategories` list.
+To hide an entire category, edit the **Media categories** singleton in the admin (one per locale) and remove that category from the `mediaCategories` list.
 
 ## Hiding the whole page