gh: Update docs deploy action.

Author: xlauko

.github/workflows/prerelease.yml

@@ -57,8 +57,8 @@ jobs:
             cmake --build --preset ninja-rel -j $(nproc)
             cpack -G TXZ --config ./builds/ninja-multi-default/CPackConfig.cmake
 
-      - name: "Publish Pre-Release"
-        uses: "marvinpinto/action-automatic-releases@latest"
+      - name: Publish Pre-Release
+        uses: marvinpinto/action-automatic-releases@latest
         with:
           repo_token: "${{ secrets.GITHUB_TOKEN }}"
           automatic_release_tag: "latest"
@@ -68,10 +68,15 @@ jobs:
             ${{ github.workspace }}/vast/LICENSE
             ${{ github.workspace }}/vast/builds/ninja-multi-default/package/vast-*/*.tar.xz
 
-      - name: "Deploy Docs"
-        uses: "benc-uk/workflow-dispatch@v1.2.2"
-        with:
-          workflow: "github pages"
-          repo: "trailofbits/vast-www"
-          token: "${{ secrets.GITHUB_TOKEN }}"
+      - name: Build VAST Doc
+        run: cmake --build --preset ninja-rel --target vast-doc
+
+      - name: Build Website
+        run: |
+          sh ./www/setup.sh _site ./builds/ninja-multi-default/
 
+      - name: Deploy docs
+        uses: mhausenblas/mkdocs-deploy-gh-pages@master
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          CONFIG_FILE: _site/mkdocs.yml