Add Mkdocs website deployment stages

Author: Daniils Petrovs

.github/workflows/release-asset.yml

@@ -85,3 +85,22 @@ jobs:
           asset_path: ./elixir-ls.zip
           asset_name: elixir-ls.zip
           asset_content_type: application/zip
+
+  build-docsite:
+    name: Build Mkdocs website
+    runs-on: ubuntu-latest
+    container:
+      image: squidfunk/mkdocs-material
+    steps:
+      - name: Build
+        run: mkdocs build -s
+
+  publish-docsite:
+    name: Publish Mkdocs website to GH Pages
+    runs-on: ubuntu-latest
+    steps:
+      - name: Publish
+        uses: JamesIves/[email protected]
+        with:
+          branch: mkdocs
+          folder: site