Document new command-line interface structure

[0x2b3bfa0]

The following pull request have introduced some drastic naming changes that should be documented:

• https://github.com/iterative/cml/pull/1026
• https://github.com/iterative/cml/pull/1073

Note Closing this issue won't only require updating the documentation, but also all the active example repositories and material.

• [x] https://cml.dev/ #324
  • [x] https://cml.dev/doc/
    • [x] https://cml.dev/doc/ref/
      • [x] runner
      • [x] comment
      • [x] check
      • [x] pr
      • [x] workflow
      • [x] tensorboard
    • [ ] DVCLive demo for --watch --publish #327
• [ ] cml readme
• [ ] example repos https://github.com/iterative/cml-examples-dev/issues/9
  • [ ] GH
  • [ ] GL
  • [ ] BB
• [x] https://github.com/iterative/cml/labels

[jorgeorpinel]

Removing labels that https://github.com/iterative/cml.dev/pull/324 seems to have taken care of.

I'd consider transferring this to cml if the main thing missing is the REAMDE update. p.s. but https://github.com/iterative/cml/issues/718 ?