update gitlab-ci yaml and docs with updated branch name

Terri Churequested to merge
71-update-gitlab-ci.yml-and-docs into main

Related to #71 (closed) Part of the work to switch to using main branch in related issue

  • Update comment in gitlab-ci.yaml (it appears to use a CI variable and does not have master hardcoded)
  • Update the documentation in the repository to reference main branch and add a note about the transition.
Edited by Terri Chu

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