Clean up meeting notes header

[StanFromIreland]

trafficstars

Currently the notes have this header

- **Date:** XXXX-XX-XX
- **Time:** [20:00 UTC](https://arewemeetingyet.com/UTC/2025-03-04/20:00/Docs%20Meeting)
- **This HackMD:** <https://hackmd.io/@encukou/pydocswg1>
- [**Discourse thread**](https://discuss.python.org/t/XXXXX) (for XXXXX)
- [**Meeting reports**](https://docs-community.readthedocs.io/en/latest/monthly-meeting/) (the latest one might be an [**unmerged PR**](https://github.com/python/docs-community/pulls))
- **Calendar event:** (send your e-mail to Mariatta for an invitation)
- **How to participate:** 

This is just for the published notes, however it could also apply to the HackMD template.

• We should remove This HackMD as it is reused, it makes no sense to have it here.
• Meeting reports makes no sense since you are reading the report!
• Calendar event/How to participate/This HackMD should be moved to their own page, maybe at Documentation Community Team > Monthly Meeting ? We can then add a single note "If you want to participate in future meetings see X"
• Date and Time could be merged