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Pamela Chia 21a27eeb4f feat(www): canonicalize homepage markdown at /index.md (#49384 )

The www root markdown lived at an accidental URL: `/.md` served the
homepage markdown only because middleware strips the `.md` suffix and
the empty slug fell through to the homepage allowlist entry, while the
canonical-looking `/index.md` 404'd. The served markdown also opened
with stale legacy positioning copy that no longer matches the site. I
renamed the homepage content slug to `index` end-to-end so `/index.md`
is the one canonical markdown URL.

**Changed:**
- **`/index.md` serves the homepage markdown (200 `text/markdown`)**:
`content/md/homepage.md` renamed to `index.md`; the middleware bare-root
slug mapping, the generator's sort special-case, and the homepage
alternate tag follow, so the tag now advertises `/index.md`.
- **Legacy aliases 308 to the canonical URL**: `/.md`, `/homepage.md`,
and bare `/index` redirect via `lib/redirects.js`; `/llms/homepage.txt`
retargeted straight to `/index.md` to avoid a redirect chain. New
`next.config.test.ts` assertions pin all four.
- **Positioning refreshed**: the markdown now opens with "Supabase is
the Postgres development platform" (matching the site title), replacing
the outdated tagline.
- **Generator safety**: the redirect-exclusion filter in
`generateMdContent.mjs` now exempts the `index` slug (its HTML page is
`/`, not `/index`, so a `/index` redirect never refers to it), and the
build fails if `content/md/index.md` ever goes missing while middleware
still maps `/` to the `index` slug.
- **CI actually runs the new assertions**: I widened the `www-tests.yml`
paths filter to include `apps/www/lib/**/*.js`,
`apps/www/content/md/**`, and `apps/www/scripts/**/*.mjs`. It previously
only matched `.ts*` and the next.config files, so a PR touching only
`lib/redirects.js`, the markdown content, or the generator would skip
the tests that pin these redirects.

**Note:** the existing homepage alternate tag still exists, re-pointed
to the canonical URL. Whether the homepage should advertise a markdown
sibling at all is a separate decision; leaving it aimed at a 308 would
break tag consumers. Positioning wording is editorial, happy to tweak.

## To test
Tested on Vercel preview:
- [x] `curl -si <preview>/index.md`: expect 200 `content-type:
text/markdown`, body opens with the Postgres development platform
positioning and no longer contains the old tagline
- [x] `curl -sI <preview>/.md`: expect 308 with `location: /index.md`
- [x] `curl -sI <preview>/homepage.md` and `curl -sI
<preview>/llms/homepage.txt`: expect 308 with `location: /index.md`
- [x] `curl -sI <preview>/index`: expect 308 with `location: /`
- [x] `curl -s -H "Accept: text/markdown" -o /dev/null -w "%{http_code}
%{content_type}" <preview>/`: expect `200 text/markdown` (bare-URL
negotiation unchanged)
- [x] `curl -s <preview>/ | grep -o 'type="text/markdown"
href="[^"]*"'`: expect href ending `/index.md`

## Linear
- fixes GROWTH-1117



<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

- **New Features**
- Added support for `/index.md` as the canonical Markdown representation
of the homepage.
- Added permanent redirects for legacy homepage Markdown and text URLs.
  - Added `/index` to `/` redirect handling.

- **Bug Fixes**
- Updated homepage metadata, alternate links, Markdown negotiation, and
content generation to consistently use the new canonical path.
  - Improved homepage content description.

- **Tests**
- Expanded coverage for homepage Markdown routes, redirects, and URL
matching.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

2026-08-24 15:19:56 +08:00

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Supabase

Build in a weekend. Scale to millions.

Supabase is the Postgres development platform: an open source backend for building web and mobile applications, with a suite of integrated tools that work together out of the box.

Products

Database: Every project is a dedicated Postgres database. Fully portable, with auto-generated REST and GraphQL APIs, a Table Editor, SQL Editor, and 40+ preinstalled extensions.
Auth: Built-in authentication and user management with 20+ social login providers, email/password, phone/OTP, and magic links. Authorization via Postgres Row Level Security.
Storage: S3-compatible object storage with a global CDN (285+ cities), image transformations, and three bucket types: files, analytics (Apache Iceberg), and vector.
Edge Functions: Globally distributed TypeScript/Deno serverless functions with Node.js compatibility, 2M+ NPM modules, and built-in observability.
Realtime: WebSocket-based real-time sync with three capabilities: database change listeners, presence (online state), and broadcast (arbitrary messages).
Vector: AI toolkit powered by pgvector for storing, indexing, and querying vector embeddings alongside transactional data in Postgres.

Data APIs

Every Supabase project auto-generates three types of APIs from your database schema:

REST: Instant CRUD API via PostgREST, no code generation needed
GraphQL: Auto-detected relationships and schema via pg_graphql
Realtime: Subscribe to database changes over WebSockets

Key Differentiators

Open source: all core tools are open source and self-hostable
Built on Postgres: industry-standard database, fully portable, no vendor lock-in
Integrated platform: auth, database, storage, functions, and realtime work together seamlessly
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Supabase

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