update Get Involved page and make BEP dashboard more prominent / colourful

[christinerogers]

for 2024, possibly GSOD -- based on Maintainers discussion April 18
https://bids.neuroimaging.io/get_involved#extending-the-bids-specification

@ericearl @Remi-Gau could be great place for DVD to get started with minor but impactful top-level website content updates/improvements.

Can be done before OHBM:

• update Get Involved page with a link to form for feedback (this was one of the first deliverables for GSOD)
• convert the paragraph of options (ways to get involved) to bullets to make it more readable / punchy
• make the BEP dashboard more prominent -- it could and probably should be on its own page (people do look for BEP status, more than they look how to get involved)
• add colour status when ready

Around OHBM:

• update BEP status table
• add link to best practices Franco's OHBM 5 best-practice slides

[christinerogers]

Note these updates are in progress and content is being split across :

• https://bids-website.readthedocs.io/en/latest/bep/
• https://bids-website.readthedocs.io/en/latest/collaboration/governance/

[Remi-Gau]

Current WIP page for this: https://bids-website.readthedocs.io/en/latest/bep/beps.html

Suggestions are welcome to make this more colorful and prominent.

[iamdamion]

PR #412 addresses point 2 of Can be done before OHBM.