Clean up tasks for jdorfman

[jdorfman]

• Update /about
  • Remove link to indetihub
  • Add link to https://github.com/sustainers/design-assets
  • Move Megan to past contribtributos
  • Remove CodeFund link
  • Alyssa Wright of Open Source Collective Bloomberg
  • Ben Nickolls of GitHub Open Collective

Add

• Hello Bar
  • Link Text: "Download the Sustain in 2021 Report!"
  • Link: assets/pdf/Sustain-In-2021-Event-Report.pdf
• Add 2021 Report https://sustainoss.org/media/#reports
• Dev patches #316

Remove

• "Sustain" on the home page (redundant)