Update community health files

[whoabuddy]

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Please include the issue number the pull request fixes by replacing YOUR-ISSUE-HERE in the text below.

Fixes #16 and #20

Summary

Details

This PR updates typos in the pull request template as well as rearranges the links in the beginning since Markdown is not processed as part of the PR text.

This PR also updates the list of Team Leads based on #16 and adds formatting for the Discord links as well as links to each Github page.

Test Plan (required)

The prettier pre-commit made sure I didn't miss any details 👍

Final Checklist

• n/a For CoronaTracker, did you bump the version in package.json?
  • Update the second decimal for a major change
  • Update the third decimal for a minor change
  • Numbers can go past 9, e.g. 1.0.9 => 1.0.10
  • For more info, read about Semantic Versioning
• Did you add any new tests as necessary?
• Is your PR rebased off the most current master?
• Have you squashed all commits? (can be done at merge)
• Did you use yarn not npm? (important!)
• Did you use Material-UI wherever possible?
• Did you run yarn lint on the code?
• Did you run all of your most recent changes locally to make sure everything is working?

[tesla809]

Looks GREAT to me!