Widen README to include community activities, not just governance

[RayStick]

Closes #27

References #

Proposed Changes

Checklist before review

• I added everything I wanted to add to this PR.
• My contribution is harmonious with the rest of the content: I'm not introducing repetitions.
• The title of this PR is explanatory on its own, enough to be understood as part of a changelog.
• I added or indicated the right labels.
• I added information regarding the timeline of completion for this PR.
• Please, comment on my PR while it's a draft and give me feedback on the development!
• (If relevant). My PR is in agreement with organization governance procedures.