Release 2.5.0

Release checklist

• Bump version in mix.exs
• Compile a changelog
• Check up with %2.5.0 for PleromaBE, PleromaFE, AdminFE
• Update PleromaFE bundle
• Update AdminFE bundle
• Create an MR with an announcement to pleroma.social: pleroma.social!77 (merged)
• Tag the release
• Merge stable into develop: !3817 (merged)