Update git submodules
* Update heat-dashboard from branch 'master'
to 1fbbf77a0a01149ce39e6b68c1a9845ae89dc17d
- Merge "[ussuri][goal] Update contributor documentation"
- [ussuri][goal] Update contributor documentation
This patch updates/adds the contributor documentation to follow
the guidelines of the Ussuri cycle community goal[1].
[1] https://governance.openstack.org/tc/goals/selected/ussuri/project-ptl-and-contrib-docs.html
Story: #2007236
Task: #38524
Change-Id: I61e494a5eb65b0a4f435eea2e511be0c398b7990
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