feat(docs): cut deploy over to the Astro site + preserve Google Analytics

deploy.yaml now builds and publishes site/ (Astro -> ./site/dist) instead of
website/ (Docusaurus). Merging to master will make echo.labstack.com serve the
new site on the next deploy. Rollback = revert this commit (website/ source
remains in the repo).

Also carry over Google Analytics (G-H19TMZLQFN, anonymize_ip) into the Astro
site's head so tracking continues uninterrupted after cutover.

Verified: site/ builds clean, GA present on every page, CNAME in dist, all 64
legacy /docs/* URLs redirect.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: vishr

.github/workflows/deploy.yaml

@@ -4,9 +4,8 @@ on:
   push:
     branches:
       - master
-  # Daily rebuild + manual trigger. Once the deploy targets the Astro site (at
-  # cutover), this refreshes build-time data like the GitHub star count in
-  # site/src/data/github.ts; until then it just redeploys the current site.
+  # Daily rebuild + manual trigger — refreshes build-time data like the GitHub
+  # star count in site/src/data/github.ts without a manual deploy.
   schedule:
     - cron: '0 6 * * *'
   # Allow manual runs from the Actions tab.
@@ -22,14 +21,14 @@ jobs:
         with:
           node-version: 24
           cache: npm
-          cache-dependency-path: website/package-lock.json
+          cache-dependency-path: site/package-lock.json
 
       - name: Install dependencies
         run: npm ci
-        working-directory: website
+        working-directory: site
       - name: Build website
         run: npm run build
-        working-directory: website
+        working-directory: site
         env:
           # Lifts the GitHub API rate limit for build-time stats fetches.
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
@@ -41,7 +40,7 @@ jobs:
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           # Build output to publish to the `gh-pages` branch:
-          publish_dir: ./website/build
+          publish_dir: ./site/dist
           # The following lines assign commit authorship to the official
           # GH-Actions bot for deploys to `gh-pages` branch:
           # https://github.com/actions/checkout/issues/13#issuecomment-724415212

site/astro.config.mjs

@@ -31,6 +31,13 @@ export default defineConfig({
         PageTitle: './src/components/PageTitle.astro',
       },
       head: [
+        // Google Analytics (carried over from the Docusaurus site, anonymized IP).
+        { tag: 'script', attrs: { async: true, src: 'https://www.googletagmanager.com/gtag/js?id=G-H19TMZLQFN' } },
+        {
+          tag: 'script',
+          content:
+            "window.dataLayer=window.dataLayer||[];function gtag(){dataLayer.push(arguments);}gtag('js',new Date());gtag('config','G-H19TMZLQFN',{anonymize_ip:true});",
+        },
         // Dark-first: default new visitors to dark unless they've chosen otherwise.
         {
           tag: 'script',