Fixup Makefile help and Speedup builds

[Racer159]

Description

This adds more help information to our Makefile and doesn't rebuild the UI unless explicitly asked for. Mostly a suggested improvement

Related Issue

Fixes # N/A

Type of change

• Bug fix (non-breaking change which fixes an issue)

Checklist before merging

• (Optional) Changes have been linted locally with golangci-lint. (NOTE: We haven't turned on lint checks in the pipeline yet so linting may be hard if it shows a lot of lint errors in places that weren't touched by changes. Thus, linting is optional right now.)

[jeff-mccoy]

I love this idea--but I think we need to tweak the git diff a bit, in testing this way won't capture staged files that are changed and I'd rather err on the side of rebuild vs not.

Current method:

Using --staged/--cached (only gets staged):

Using git diff HEAD gets both staged & un-staged changes:

[Racer159]

I love this idea--but I think we need to tweak the git diff a bit, in testing this way won't capture staged files that are changed and I'd rather err on the side of rebuild vs not.

Current method:

### Using `--staged/--cached` (only gets staged): ### Using `git diff HEAD` gets both staged & un-staged changes:

Good catch! Changed to git diff HEAD

[jeff-mccoy]

Love this feature!