workflows: Improve documentation workflow (#104)

Author: michaelkuhn

.github/workflows/documentation.yml

@@ -29,7 +29,7 @@ jobs:
           doxygen
       - name: Copy documentation
         run: |
-          rsync --archive --human-readable --verbose --delete master/html/. pages
+          rsync --archive --human-readable --verbose --delete --exclude=.git master/html/. pages
           touch pages/.nojekyll
       - name: Commit documentation
         run: |