Remove H1 headings from wiki pages (GitHub auto-generates title from filename)
Updates
docs: update wiki for v3.0.0 InMemoryCosmos API - Updated: Home, Sidebar, Getting-Started, Integration-Approaches, API-Reference, Dependency-Injection, Features, Feed-Iterator, Seeding-Data, Troubleshooting, Feature-Comparison - New pages: Multi-Database, Migration-Guide (2.x -> 3.0.0) - Marked CreateClient/WrapClient/CreateRouter as removed in 3.0.0 - Added InMemoryCosmos, InMemoryCosmosBuilder, InMemoryCosmosResult API docs