Add a GH action for deploying to GH pages.

.github/workflows/ci.yml

@@ -0,0 +1,24 @@
+name: ci
+on:
+  push:
+    branches:
+      - main
+permissions:
+  contents: write
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-python@v4
+        with:
+          python-version: 3.x
+      - run: echo "cache_id=$(date --utc '+%V')" >> $GITHUB_ENV
+      - uses: actions/cache@v3
+        with:
+          key: mkdocs-material-${{ env.cache_id }}
+          path: .cache
+          restore-keys: |
+            mkdocs-material-
+      - run: pip install mkdocs-material
+      - run: mkdocs gh-deploy --force

.gitignore

@@ -5,3 +5,4 @@ build/
 *.orig
 *.ini
 Testing/
+site/

docs/index.md

@@ -1,4 +1,3 @@
 # Merle
 
-A SIMD image manipulation library.
-
+A "portable" SIMD image manipulation library.