Add GitHub Releases and version-based OTA updates

- Add __version__ = "0.1.0" to src/server.py
- Add release.yml workflow to create GitHub Releases on v* tags
- Refactor start.sh OTA to use GitHub Releases API instead of commit SHAs

.github/workflows/release.yml

@@ -0,0 +1,19 @@
+name: GitHub Release
+
+on:
+  push:
+    tags: ["v*"]
+
+permissions:
+  contents: write
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: softprops/action-gh-release@v2
+        with:
+          generate_release_notes: true
+          prerelease: ${{ contains(github.ref_name, 'v0.') }}