Fix README formatting and add snake animation workflow

- Convert all HTML anchor tags with images to markdown syntax
- Add GitHub Action workflow for snake animation
- Update snake animation to use proper light/dark mode
- Fix broken badge display issues

.github/workflows/snake.yml

@@ -0,0 +1,33 @@
+name: Generate Snake
+
+on:
+  schedule:
+    # Runs every 12 hours
+    - cron: "0 */12 * * *"
+  
+  workflow_dispatch:
+  
+  push:
+    branches:
+      - main
+
+jobs:
+  generate:
+    runs-on: ubuntu-latest
+    
+    steps:
+      - name: Generate Snake
+        uses: Platane/snk/svg-only@v3
+        with:
+          github_user_name: developtheweb
+          outputs: |
+            dist/github-contribution-grid-snake.svg
+            dist/github-contribution-grid-snake-dark.svg?palette=github-dark
+      
+      - name: Push to output branch
+        uses: crazy-max/ghaction-github-pages@v4
+        with:
+          target_branch: output
+          build_dir: dist
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}