actions 0.2.0

• new actions & example workflows:
  • label-issue-repo-name - Label issues & PRs with the repository name
  • add-issue-label-list - Update issue description with a list of issues of a given label
  • update-cff-R - For R packages: update the CITATION.cff file based on the DESCRIPTION file.
  • build-docker - Build docker containers for CCBR/Dockers2. (#31, #33, @kelly-sovacool)
• minor documentation improvements.