fix: drop --strict from docs preview build

Pre-existing warnings (broken links in CONTRIBUTING.md, recipe paths,
notebook_source README) cause strict mode to abort. Remove --strict
until those are fixed separately.

Author: andreatgretel

.github/workflows/docs-preview.yml

@@ -74,7 +74,7 @@ jobs:
           done
 
       - name: Build docs
-        run: uv run mkdocs build --strict
+        run: uv run mkdocs build
 
       - name: Upload docs artifact
         uses: actions/upload-artifact@v4