Review new mentors selection policy

[khairahscorner]

We need to review our selection policy for new mentors: https://docs.google.com/document/d/1-LmGKht77sw7pC515AV3n3diwe2KPtcnS3isAl6oMZ4/edit?tab=t.0#heading=h.4nrc5snbaqla

ACs

• cleanup current guide
• outline clear criterias to be used from 2026
• add new tab to outline our criteria for reviewing and filtering current mentors (15-minute session schedule, reviewing feedback provided by mentees, etc)
• mark outdated/not-in-use ones

[khairahscorner]

@Deejarh