Detect duplicates

This only applies to duplicates within the same scope (same user, same group)

Merge if duplicates are detected

For "duplicates" in different scopes (different User, different Group), we should surface them via Similar pages in Page discovery

Then again sometimes pages might have the Same title over and over again because they're daily notes or daily observations, so perhaps those could go into Timeline view filtered by same title

Even among Alternative titles we must detect theses