fix(www): remove the stale bun.lock that fails the Cloudflare Pages build (#456)

The site moved to pnpm in July 2025 and pnpm-lock.yaml is the lockfile
kept up to date, but www/bun.lock was left behind and still pins Astro 5.
The Cloudflare Pages build image now installs with bun when it finds a
bun.lock, and bun install --frozen-lockfile stops on the stale file, so
every docs build has failed since.

Remove it, ignore it in www so a local bun install cannot bring it back,
and point the site README and CLAUDE.md at pnpm.

www/.gitignore

@@ -5,6 +5,10 @@ dist/
 
 # dependencies
 node_modules/
+# pnpm-lock.yaml is the lockfile. Cloudflare Pages installs with Bun when a
+# bun.lock is present, and a stale one fails the build.
+bun.lock
+bun.lockb
 
 # logs
 npm-debug.log*

www/CLAUDE.md

@@ -11,18 +11,18 @@ This is the marketing website for Gitea Mirror, built with Astro and Tailwind CS
 ## Essential Commands
 
 ```bash
-bun install         # Install dependencies
-bun run dev         # Start development server (port 4321)
-bun run build       # Build for production
-bun run preview     # Preview production build
+pnpm install        # Install dependencies (pnpm-lock.yaml is the lockfile)
+pnpm dev            # Start development server (port 4321)
+pnpm build          # Build for production
+pnpm preview        # Preview production build
 ```
 
 ## Architecture & Key Concepts
 
 ### Technology Stack
-- **Framework**: Astro (v5.0.5) - Static site generator with React integration
+- **Framework**: Astro (v7) - Static site generator with React integration
 - **UI**: React (v19.0.0) + Tailwind CSS v4
-- **Runtime**: Bun
+- **Package manager**: pnpm. Do not commit a bun.lock: Cloudflare Pages installs with Bun when it finds one
 - **Styling**: Tailwind CSS v4 with Vite plugin
 
 ### Project Structure

www/README.md

@@ -5,8 +5,8 @@ This Astro workspace powers the public marketing experience for Gitea Mirror. It
 ## Developing Locally
 
 ```bash
-bun install
-bun run dev
+pnpm install
+pnpm dev
 ```
 
 The site is available at `http://localhost:4321`. Tailwind CSS v4 handles styling; classes can be used directly inside Astro, MDX, and React components.
@@ -23,8 +23,8 @@ The site is available at `http://localhost:4321`. Tailwind CSS v4 handles stylin
 
 1. Add or update a record in `src/lib/use-cases.ts`. This keeps the landing page and library listing in sync.
 2. Create a new MDX file in `src/pages/use-cases/<slug>.mdx` with the `UseCaseLayout` layout and descriptive frontmatter.
-3. Run `bun run dev` to preview the layout and ensure the new guide inherits global styles.
+3. Run `pnpm dev` to preview the layout and ensure the new guide inherits global styles.
 
 ## Deployment
 
-The marketing site is built with the standard Astro pipeline. Use `bun run build` to generate a production build before deploying.
+The marketing site is built with the standard Astro pipeline. Use `pnpm build` to generate a production build before deploying.