update + restructure pom and add missing javadoc

.github/workflows/pages.yml

@@ -0,0 +1,34 @@
+name: Pages
+
+on:
+  workflow_dispatch:
+  workflow_run:
+    workflows:
+      - Main
+    types:
+      - completed
+
+jobs:
+  pages:
+    runs-on: ubuntu-latest
+    if: github.event_name == 'workflow_dispatch' || github.event.workflow_run.conclusion == 'success'
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+
+      - uses: actions/setup-java@v2
+        with:
+          distribution: "adopt"
+          java-version: "8"
+          check-latest: true
+          cache: "maven"
+
+      - name: Create GitHub Pages
+        run: mvn site
+
+      - name: Deploy GitHub Pages
+        uses: peaceiris/actions-gh-pages@v3
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: ./target/site