Docs: Change task topic titles from gerunds to imperatives

[chri2547]

Change all task topics to (imperative) verb + object instead of using gerunds.

General approach:

1. Add an alias that is self-referencing to all files.
2. Commit the changes.
3. Run doc-validator locally; leave global link checking for later.
4. Commit the changes.
5. Move a directory of files from -ing ending to imperative.
6. Rerun doc-validator locally on that directory; leave global link checking for later.
7. Fix any broken links with mv-manager.
8. Rerun doc-validator from .../doc/sources in the mimir repo.
9. Repeat as needed.
10. Commit the changes.

[osg-grafana]

This involves link checking and alias changes.

[osg-grafana]

Moving to 2.3 per conversation with @dimitarvdimitrov, because these changes are forward-facing changes and it reduces the need to cherry pick for 2.2.

[osg-grafana]

Per @pracucci, the paths that are now absolute need to be relative.

[osg-grafana]

Increasing estimate of complexity of this issue.

[pracucci]

Increasing estimate of complexity of this issue.

No. It's not a requirement. Aliases can both be absolute or relative (both are supported). There are pros and cons of both. The reason why I opened https://github.com/grafana/mimir/pull/2396 is because in https://github.com/grafana/mimir/pull/2351 the relative paths were rewritten adding a / in front of them (so making them absolute, but without changing them to be real absolute paths).

[osg-grafana]

@KMiller-Grafana, here is an issue that might cause problems with links breaking. @gguillotte-grafana is investigating how we can get visibility about which links are broken where across all Grafana Labs documentation. cc @knylander-grafana and @Eve832

[Eve832]

@pracucci is correct. The relrefs will still work either way, but it's not a good habit. I think if we're linking across repos, we can either use ref instead of relref or absolute URLs.

[osg-grafana]

@colega, added you as assignee because you volunteered. :)