Add help to makefile

[benjaminapetersen]

The new Secrets Store Sync Controller has a nice output when make help (or bare make) is run. This PR just borrows the .PHONY: help incantation then reformats the headings and comments on [some] commands to match the regex in the @awk to print the following:

This is a quick pass to get some headings and commands and text printed. The specific output combo of headings/commands/text is up for conversation and feedback.

What type of PR is this?

I would consider this:

/kind documentation

What this PR does / why we need it:

See above comment and screenshot.

Which issue(s) this PR fixes (optional, using fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when the PR gets merged):
Fixes #1681

Special notes for your reviewer:

Happy to take feedback on the specific items to print.

TODOs:

• squashed commits
• includes documentation
• [ ] adds unit tests n/a

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: benjaminapetersen
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[k8s-ci-robot]

Hi @benjaminapetersen. Thanks for your PR.

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