Update the Popular theme to v0.7.0 and add an llms.txt for agents (#89)

Theme v0.6.0 -> v0.7.0. Most of the release is meetup machinery we do not use
(calendar feed, venue logistics, talk archive, community-chat CTA), and the
empty-state fix does not apply because we have no events section.

Adopted here:

- The profile back link on speaker and host pages. Both templates are our own
  forks, so the theme change does not reach them automatically. Hosts get
  "All hosts" rather than the theme's "All organizers".
- /llms.txt, a plain-text summary for AI agents. The theme's template is
  meetup-shaped, so layouts/index.llms.txt overrides it with the show: latest
  episode, where to listen, the five most recent full episodes, and the key
  pages. Regenerated every build.
- popularVersion = "" to keep the theme's new footer version badge off this
  site, without forking the footer partial.

Author: Mariatta

config/_default/params.toml

@@ -37,6 +37,10 @@ brandSub = "Hidden Figures of Python"
 ogImage = "images/pypodcats-2025-s.png"
 customCSS = ["css/pypodcats.css"]
 
+# The theme sets popularVersion (v0.7.0+) and the footer prints it next to the
+# Popular credit. Blank it so this site's footer keeps just the credit link.
+popularVersion = ""
+
 # Popular theme v0.6.0: SEO knobs
 [seo]
   # Keep FAQPage JSON-LD from {{< faq >}} blocks (default true).

hugo.toml

@@ -75,7 +75,9 @@ target = '$1'
 
 ############################# Outputs ############################
 [outputs]
-home = ["HTML", "RSS", "WebAppManifest", "SearchIndex"]
+# LLMS emits /llms.txt for AI agents (Popular theme v0.7.0); the format itself
+# comes from the theme, the content from layouts/index.llms.txt.
+home = ["HTML", "RSS", "WebAppManifest", "SearchIndex", "LLMS"]
 section = ['html', 'rss']
 
 ############################# Imaging ############################

layouts/index.llms.txt

@@ -0,0 +1,31 @@
+{{- /* §8 llms.txt for the podcast layer. The theme's version (themes/popular/
+     layouts/index.llms.txt) is meetup-shaped: it names the next upcoming
+     event and links the iCalendar feed, neither of which exists here. This
+     override answers the questions an agent actually has about a podcast:
+     what the show is, where to listen, and what the latest episodes are.
+     Regenerated every build, so the latest-episode line stays true. */ -}}
+{{- $full := where (where site.RegularPages "Section" "episodes") "Params.episode_type" "!=" "trailer" -}}
+{{- $recent := first 5 $full.ByDate.Reverse -}}
+{{- $latest := index $recent 0 -}}
+# {{ site.Title }}
+{{ with site.Params.description }}
+{{ . }}
+{{ end }}
+{{ with $latest }}Latest episode: {{ .Title }}, published {{ .Date | time.Format ":date_long" }} ({{ .Permalink }}){{ end }}
+
+## Listen and follow
+{{ range site.Params.social }}{{ .label }}: {{ .url | absURL }}
+{{ end }}
+## Recent episodes
+{{ range $recent }}{{- $ep := . -}}- {{ .Title }}, {{ .Date | time.Format ":date_long" }}{{ with .Params.speaker }}{{ if not (in $ep.Title .title) }}, guest {{ .title }}{{ end }}{{ end }} ({{ .Permalink }})
+{{ end }}
+## Links
+All episodes: {{ (site.GetPage "/episodes").Permalink }}
+Guests: {{ (site.GetPage "/speakers").Permalink }}
+Hosts: {{ (site.GetPage (print "/" (partial "section.html" "team"))).Permalink }}
+Blog: {{ (site.GetPage "/blog").Permalink }}
+{{ with site.GetPage "/about" }}About and FAQ: {{ .Permalink }}
+{{ end }}{{ with site.GetPage "/subscribe" }}Subscribe: {{ .Permalink }}
+{{ end }}{{ with site.GetPage "/contact" }}Contact: {{ .Permalink }}
+{{ end }}
+Built with the Popular theme.

layouts/organizers/single.html

@@ -12,7 +12,9 @@
 {{- end -}}
 {{- $posts := where (where site.RegularPages "Section" "blog") "Params.authors" "intersect" (slice $slug) -}}
 
-{{ partial "page-hero.html" (dict "eyebrow" (.Params.role | default "Host") "title" .Title) }}
+{{- /* Theme 0.7.0 back link, with our own label: the theme string for this
+       section says "All organizers", and we call them hosts. */ -}}
+{{ partial "page-hero.html" (dict "eyebrow" (.Params.role | default "Host") "title" .Title "backHref" (print (partial "section.html" "team") "/") "backLabel" "All hosts") }}
 
 <section class="g-bg-ink">
   <div class="g-container g-stats">

layouts/speakers/single.html

@@ -4,7 +4,7 @@
        pages repeat the bio as body text), so render it once in the persona
        card, and list the speaker's episodes instead of the theme's
        events-based sessions. */ -}}
-{{ partial "page-hero.html" (dict "eyebrow" (.Params.eyebrow | default "Speaker") "title" .Title) }}
+{{ partial "page-hero.html" (dict "eyebrow" (.Params.eyebrow | default "Speaker") "title" .Title "backHref" "speakers/" "backLabel" (i18n "allSpeakers")) }}
 <section class="g-bg-white g-section">
   <div class="g-container">
     <div class="g-article" style="margin-bottom:var(--space-5)">