Migrate from GitHub Pages to itch.io with automated CI/CD

Add GitHub Actions workflow that builds WebGL via GameCI and deploys
to itch.io via butler on every push to main. Remove docs/ directory
(old GitHub Pages build) and update README links to itch.io.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: Chilly5

.github/workflows/build-and-deploy.yml

@@ -0,0 +1,41 @@
+name: Build and Deploy to itch.io
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  build-webgl:
+    name: Build WebGL & Deploy
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - uses: actions/cache@v4
+        with:
+          path: Open Empires/Library
+          key: Library-WebGL-${{ hashFiles('Open Empires/Assets/**', 'Open Empires/Packages/**', 'Open Empires/ProjectSettings/**') }}
+          restore-keys: |
+            Library-WebGL-
+
+      - uses: game-ci/unity-builder@v4
+        env:
+          UNITY_EMAIL: ${{ secrets.UNITY_EMAIL }}
+          UNITY_PASSWORD: ${{ secrets.UNITY_PASSWORD }}
+          UNITY_SERIAL: ${{ secrets.UNITY_SERIAL }}
+        with:
+          projectPath: Open Empires
+          unityVersion: 6000.3.9f1
+          targetPlatform: WebGL
+          buildName: OpenEmpires
+
+      - uses: manleydev/butler-publish-itchio-action@v1.0.3
+        env:
+          BUTLER_CREDENTIALS: ${{ secrets.BUTLER_CREDENTIALS }}
+          CHANNEL: html5
+          ITCH_GAME: ${{ vars.ITCH_GAME }}
+          ITCH_USER: ${{ vars.ITCH_USER }}
+          PACKAGE: build/WebGL/OpenEmpires

README.md

@@ -14,7 +14,7 @@
 
 **An open-source Age of Empires-inspired RTS built with Unity 6 and a Rust relay server backend, featuring deterministic lockstep multiplayer.**
 
-[**Play the Demo**](https://chilly5.github.io/OpenEmpires/)
+[**Play the Demo**](https://chilly5.itch.io/open-empires)
 
 </div>
 
@@ -74,7 +74,7 @@
 
 ### WebGL Build
 
-A pre-built WebGL version is available in the `docs/` folder and can be served as a static site.
+WebGL builds are automatically deployed to itch.io via GitHub Actions on every push to `main`.
 
 ## Architecture
 
@@ -106,7 +106,7 @@ Open Empires/
     Prefabs/           # Unit and building prefabs
     Scenes/            # Game scenes
 backend/               # Rust relay/matchmaking server
-docs/                  # WebGL build
+.github/workflows/     # CI/CD pipeline
 ```
 
 ## Community