Remove --doc-filter from CLI

[bdice]

Feature description

From #586 conversation: https://github.com/glotzerlab/signac/pull/586#issuecomment-904777526

Yes, I think --doc-filter should be removed in all cases. The signac-flow PR is less urgent since it only needs to go in before whichever flow version is the first to support signac 2.0, but adding the warning for find --doc-filter in this PR makes sense.

I decided to tackle this in a follow-up PR rather than extend #586.

Proposed solution

signac find --doc-filter ... should be deprecated in 2.0 and removed in 3.0. A warning should be shown in signac 2.0.

--doc-filter should be deprecated and removed from signac-flow's CLI (e.g., project.py status --doc-filter ...).

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[kidrahahjo]

I can take this up @bdice or we can add a good first issue label on this for others to try?

[vyasr]

I think this would be a good first issue to let someone else take on. IMO there are more complicated things that would benefit more from your expertise :)

[vyasr]

Based on recent discussions, this issue must be resolved for signac 2.0.

[vyasr]

Resolved in #795.