Unify api examples with bigger examples

[nikolausWest]

Following #2272, there is no real reason to split the examples page into two sub-pages with real and fake data. Instead that could be handled by just filtering on tags as well. In addition we should also surface all the api examples, currently hidden under https://www.rerun.io/docs/reference/data_types, in the main examples page, also filtered by tags. These new set of tags should probably be in a different category than the existing tags (e.g. "openCV" and "SLAM").