docs(README): Sort list and add Greenhouse

[jcmuller]

Checklist:

• Either (a) I've created an enhancement proposal and discussed it with the community, (b) this is a bug fix, or (c) this is a chore.
• The title of the PR is (a) conventional, (b) states what changed, and (c) suffixes the related issues number. E.g. "fix(controller): Updates such and such. Fixes #1234".
• I have written unit and/or e2e tests for my change. PRs without these are unlike to be merged.
• Optional. I've added My organization is added to the README.
• I've signed the CLA and required builds are green.

[claassistantio]

All committers have signed the CLA.

[codecov]

Codecov Report

Merging #2182 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2182   +/-   ##
=======================================
  Coverage   11.71%   11.71%           
=======================================
  Files          51       51           
  Lines       26309    26309           
=======================================
  Hits         3081     3081           
  Misses      22833    22833           
  Partials      395      395

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[alexec]

LGTM! Thank you for adding your org.