Source content from Obsidian vault via CONTENT_BASE env var

Locally: reads from /Users/neeldhara/gitea/obsidian/public/blogs/micro (via .env)
CI: reads from ./src/content (snapshot committed to repo)
Amp-Thread-ID: https://ampcode.com/threads/T-019c7839-0936-729b-aa87-92b35d3d68fe
Co-authored-by: Amp <amp@ampcode.com>

.gitea/workflows/deploy.yml

@@ -16,7 +16,10 @@ jobs:
           cache: npm
 
       - run: npm ci
-      - run: npm run build
+      - name: Build
+        run: npm run build
+        env:
+          CONTENT_BASE: ./src/content
 
       - name: Deploy to Netlify
         uses: nwtgck/actions-netlify@v3