chore(ci): use strict docs building

This prevents warnings from going unnoticed.

Signed-off-by: JP-Ellis <josh@jpellis.me>

Author: JP-Ellis

.github/workflows/docs.yml

@@ -42,7 +42,7 @@ jobs:
 
       - name: Build docs
         run: |
-          hatch run mkdocs build
+          hatch run mkdocs build --strict
 
       - name: Upload artifact
         uses: actions/upload-pages-artifact@7b1f4a764d45c48632c6b24a0339c27f5614fb0b  # v4