Add partner contacts, Slack community guidelines, contact page

Georgia Stuartrequested to merge
add-partner-contacts into main

Requires Theme MR !25

  • Adds the contact page at /contact/
  • Adds partner contact people at /people/ (alphabetical by institution)
  • Adds Slack community guidelines at /contact/community/
  • Adds Mount Holyoke as a top-level partner

Signed-off-by: Georgia Stuart gstuart@umass.edu

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