Publish API reference (Dokka HTML) to GitHub Pages (#32) (#40)

* docs: design spec for Dokka HTML API reference on GitHub Pages (#32)

* docs: implementation plan for Dokka API reference on GitHub Pages (#32)

* build: migrate Dokka 1.9.20 -> 2.2.0 (DGP v2) (#32)

* docs: aggregate all modules into one Dokka HTML site with source links (#32)

* docs: add Dokka source links to serialization/coroutines/compose modules (#32)

* ci: add docs workflow to deploy Dokka HTML to GitHub Pages (#32)

* docs: link the published API reference from the README (#32)

.github/workflows/docs.yml

@@ -0,0 +1,46 @@
+name: Docs
+
+on:
+  release:
+    types: [released]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+concurrency:
+  group: pages
+  cancel-in-progress: false
+
+jobs:
+  build:
+    name: Build Dokka HTML
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out code
+        uses: actions/checkout@v4
+      - name: Set up JDK 21
+        uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: '21'
+      - name: Generate API docs
+        run: ./gradlew :dokkaGeneratePublicationHtml --console=plain
+      - name: Upload Pages artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: build/dokka/html
+
+  deploy:
+    name: Deploy to GitHub Pages
+    needs: build
+    runs-on: ubuntu-latest
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    steps:
+      - name: Deploy
+        id: deployment
+        uses: actions/deploy-pages@v4