git: extend git flow to use it tactically

[kamilsk]

• https://stackoverflow.blog/2022/04/06/use-git-tactically/
• https://dev.to/render/git-organized-a-better-git-flow-56go, https://render.com/blog/git-organized-a-better-git-flow
• https://martinfowler.com/articles/ship-show-ask.html

[kamilsk]

• use git config as source of truth
• git config github.url / jira.url / etc
• commands:
  • git stop: commit wip, checkout default
  • git start: stop, pull, checkout -b / checkout, undo wip
  • git step: add incremental commit (tactic)
  • git progress: commit with prefix and squash steps