chore: rename github group to match org. structure

[matthugs]

TL;DR - [ A short summary of what this PR does and why ]

JIRA: JIRA-XXXX

What changed?

• [ More in depth breakdown of changes ]
• [ Peripheral things that got changed ]
• [ etc... ]

Developer Checklist

• [ ] Test suites passing
• [ ] Documentation and test plan updated, if applicable
• [ ] Received code-owner approving review
• [ ] Bumped version number package.json

Testing Instructions

[ How should a reviewer test this PR? ]

Reviewer Checklist

Collectively, these should be completed by reviewers of this PR:

• [ ] I've done a visual code review
• [ ] I've tested the new functionality

FYI: @edx/masters-devs-gta

[codecov[bot]]

Codecov Report

Merging #227 (7a195ca) into master (650be29) will not change coverage. The diff coverage is n/a.

:exclamation: Current head 7a195ca differs from pull request most recent head 31748e2. Consider uploading reports for the commit 31748e2 to get more accurate results

@@            Coverage Diff            @@
##            master      #227   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          110       110           
  Lines         1270      1270           
  Branches       244       244           
=========================================
  Hits          1270      1270           

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