With no entry in the docs-site nav (removed there so awesome-pages can
discover the synced trees), MkDocs derives the section name from the directory
and title-cases it, rendering "Nixfiles". The previous hardcoded nav spelled it
lowercase. Setting title in docs/.pages restores that without reintroducing a
nav entry.
Verified by rebuilding the aggregated site locally with both source trees
synced as the workflow does.
Emma Thorpe