Add generated index with two taxonomies, sitemap, and community repo setup

- repos.yaml: central registry of Supermodel + community repos
- generate-index.go: builds index.html with search and sitemap.xml
- build-index.yml: GitHub Actions workflow to regenerate on changes
- setup-community-repos.sh: script to fork, configure, and deploy community repos

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: codegraphtheory

.github/workflows/build-index.yml

@@ -0,0 +1,44 @@
+name: Build Index
+
+on:
+  push:
+    paths: [repos.yaml, generate-index.go]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+concurrency:
+  group: pages
+  cancel-in-progress: true
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    environment:
+      name: github-pages
+      url: ${{ steps.deploy.outputs.page_url }}
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-go@v5
+        with:
+          go-version: '1.24'
+
+      - name: Init Go module
+        run: |
+          go mod init generate-index
+          go mod tidy
+
+      - name: Generate site
+        run: go run generate-index.go
+
+      - uses: actions/upload-pages-artifact@v3
+        with:
+          path: ./site
+
+      - name: Deploy to GitHub Pages
+        id: deploy
+        uses: actions/deploy-pages@v4