fix

Author: MariusStorhaug

.github/workflows/hugo.yml

@@ -54,6 +54,7 @@ jobs:
         run: |
           git submodule add https://github.com/google/docsy.git themes/github.com/google/docsy
           git submodule add https://github.com/FortAwesome/Font-Awesome.git themes/github.com/FortAwesome/Font-Awesome
+          git submodule add https://github.com/twbs/bootstrap.git themes/github.com/twbs/bootstrap
       - name: Build with Hugo
         env:
           # For maximum backward compatibility with Hugo modules