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Saxon Fletcher b1d2efd99e feat(library): add starter app guides (#50368)
## I have read the
[CONTRIBUTING.md](https://github.com/supabase/supabase/blob/master/CONTRIBUTING.md)
file.

YES

## What kind of change does this PR introduce?

Feature, docs.

Part 2 of 6 in a stack that splits the library redesign into reviewable
pieces.

## What is the current behavior?

The library documents individual blocks. Nothing answers "I have no
project yet" — a reader who wants a working app has to assemble one from
block guides and figure out the scaffolding themselves.

## What is the new behavior?

Four starter guides under `/docs/starters`, each starting from an empty
directory and ending with a running app on Supabase:

- **Next.js starter** — composes the library's own password-based auth
block.
- **SaaS starter** — the community subscription-payments template, with
Stripe setup.
- **AI chat app** — the community Vercel AI SDK template.
- **Flutter starter** — the user-management example, with profiles and
avatar uploads.

They reuse the existing doc route, so the sidebar, command menu,
Markdown export and `llms.txt` pick them up with no new plumbing. The
framework selector already renders nothing for pages that declare no
framework variants, so a starter page shows none.

## Additional context

The starter pages are added here in the current site's page layout; the
last PR in the stack converts them to the new one along with every other
guide.


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

- **New Features**
- Added a Starter Apps section to the side navigation and command menu.
- Added links for Next.js, SaaS, AI Chat, and Flutter starter projects,
marked as new.

- **Documentation**
  - Added setup and deployment guides for the Next.js and SaaS starters.
- Added an AI Chat App guide covering configuration, local verification,
and deployment.
- Added a Flutter starter guide covering authentication, profiles,
avatars, deep links, and hosted setup.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

---------

Co-authored-by: Claude Opus 5 <noreply@anthropic.com>
2026-09-18 10:38:49 +10:00
..