Add meeting theme with numbered contribs & remove nicecompact

[ThiefMaster]

We have this in the CERN theme for the council, but there are many meetings where contribution times/durations are meaningless.

We can probably just use these settings we already apply for the council theme, but let's check if each one of them is useful here.

    settings:
      hide_duration: true
      hide_session_block_time: true
      number_contributions: true
      hide_end_time: true

We may also want to have two new themes for this, one with inline minutes and one without (especially since we use the one with inline minutes in our own meeting ;))

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This also closes #4900