fix(site): reset installation guide to implemented features

[decepulis]

Summary

• Limits installation guide renderers to what actually ships today (html5-video, html5-audio, hls, background-video)
• Fixes install commands to use @next tag and CDN URLs to use correct jsdelivr paths
• Fixes React API references (features.video → videoFeatures, skin tag names)
• Removes Mux-specific playbackId logic that isn't implemented yet
• Hides unfinished doc pages (architecture, skins, ui-components, customize-skins)
• Updates roadmap dates (beta → March 2026, removes old tech preview section)

Test plan

• Verify installation guide renders correctly on the site
• Confirm CDN URLs resolve on jsdelivr
• Check that all code snippets in the guide are accurate
• Verify hidden pages don't appear in sidebar navigation

🤖 Generated with Claude Code

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[github-actions]

📦 Bundle Size Report

Package	Size	Diff		%
@videojs/core	10.41 kB	0 B	░░░░░░░░	0%	✅
@videojs/element	1.60 kB	0 B	░░░░░░░░	0%	✅
@videojs/html	26.98 kB	0 B	░░░░░░░░	0%	✅
@videojs/icons	7.49 kB	0 B	░░░░░░░░	0%	✅
@videojs/react	15.08 kB	0 B	░░░░░░░░	0%	✅
@videojs/store	1.96 kB	0 B	░░░░░░░░	0%	✅
@videojs/utils	2.81 kB	0 B	░░░░░░░░	0%	✅

Total: 66.33 kB · 0 B · 0%

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Entry Breakdown

Subpath sizes are the additional bytes on top of the root entry point, measured by bundling root + subpath together and subtracting the root-only size.

@videojs/core

Entry	Base	PR	Diff	%
.	4.39 kB	4.39 kB	0 B	0%	✅
./dom	6.03 kB	6.03 kB	0 B	0%	✅
total	10.41 kB	10.41 kB	0 B	0%

@videojs/element

Entry	Base	PR	Diff	%
.	817 B	817 B	0 B	0%	✅
./context	823 B	823 B	0 B	0%	✅
total	1.60 kB	1.60 kB	0 B	0%

@videojs/html

Entry	Base	PR	Diff	%
.	15.45 kB	15.45 kB	0 B	0%	✅
./video	9.44 kB	9.44 kB	0 B	0%	✅
./audio	1.06 kB	1.06 kB	0 B	0%	✅
./background	1.02 kB	1.02 kB	0 B	0%	✅
total	26.98 kB	26.98 kB	0 B	0%

@videojs/icons

Entry	Base	PR	Diff	%
./react	2.27 kB	2.27 kB	0 B	0%	✅
./html	1.52 kB	1.52 kB	0 B	0%	✅
./render	1.59 kB	1.59 kB	0 B	0%	✅
./element	2.11 kB	2.11 kB	0 B	0%	✅
total	7.49 kB	7.49 kB	0 B	0%

@videojs/store

Entry	Base	PR	Diff	%
.	1.31 kB	1.31 kB	0 B	0%	✅
./html	472 B	472 B	0 B	0%	✅
./react	199 B	199 B	0 B	0%	✅
total	1.96 kB	1.96 kB	0 B	0%

@videojs/utils

Entry	Base	PR	Diff	%
./array	104 B	104 B	0 B	0%	✅
./dom	928 B	928 B	0 B	0%	✅
./events	227 B	227 B	0 B	0%	✅
./function	261 B	261 B	0 B	0%	✅
./object	119 B	119 B	0 B	0%	✅
./predicate	265 B	265 B	0 B	0%	✅
./string	148 B	148 B	0 B	0%	✅
./style	185 B	185 B	0 B	0%	✅
./time	478 B	478 B	0 B	0%	✅
./number	158 B	158 B	0 B	0%	✅
total	2.81 kB	2.81 kB	0 B	0%

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ℹ️ How to interpret

Sizes are minified + brotli, measured with esbuild.
Package totals are computed as root size + marginal subpath costs.
Subpath marginal cost = (root + subpath bundled together) − root alone.

Icon	Meaning
✅	No change
🔺	Increased ≤ 10%
🔴	Increased > 10%
🔽	Decreased
🆕	New (no baseline)

Run pnpm size locally to check current sizes.