Onboard new organizers

[dcwalk]

Phew, last two weeks a whirlwind, just to make sure I've done everything:

TODOs:

• [x] add to signal group
• [x] add to orga@
• [x] add google-friendly email to calendar, gdrive
• [x] invite to github
• [x] add to mayfirst drive
• [x] add to mailing list (and mailing list admin interface?)
• [x] UPDATE README :tada:

[dcwalk]

Sent invites to everything! Will close for now and troubleshoot mayfirst access if any issues crop up.