Remove collab metrics section on chart readme

[wgalanciak]

We should remove from the readme the section about metrics (prometeus) etc.

[DavidRS13]

@danc094codetogether is this testeable? Please provide some information for testing.

[danc094codetogether]

@DavidRS13 Sure, check the README file of the collab chart. It doesn’t contain any sections about metrics anymore.

[DavidRS13]

Done ✅