Some Doxygen fixes.

Author: nicolasnoble

.github/workflows/chores.yml

@@ -75,7 +75,7 @@ jobs:
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
       - name: Install doxygen
-        run: sudo apt-get install -y doxygen
+        run: sudo apt-get install -y doxygen graphviz
       - name: Filter repository
         env:
           FILTER_BRANCH_SQUELCH_WARNING: 1
@@ -95,16 +95,16 @@ jobs:
           doxygen /tmp/Doxyfile
           mv html /tmp
           rm -rf latex
-          git checkout gh_pages
+          git checkout --orphan gh_pages
           git rm -rf .
           mv /tmp/html/* .
           git add .
-          git commit --amend --no-edit
+          git commit -m "Documentation."
       - name: Pushing documentation
         env:
           PAT: ${{ secrets.PAT }}
         run: |
-          git push --force "https://nicolasnoble:$PAT@github.com/pcsx-redux/nugget.git" gh_pages
+          git push --force https://nicolasnoble:$PAT@github.com/pcsx-redux/nugget.git gh_pages
 
   export-support:
     runs-on: ubuntu-latest