Add mention of tags and ARM environments to developer start guide

[PaulScemama]

Resolves 1457

Very minimal change to the documentation for developer install guide. It

1. adds instruction to collect tags.
2. notes a possible error when using git:// and gives instruction to resolve if the issue occurs.
3. notes using environment-arm.yml when creating conda environment if using ARM processor.

Here are a few important guidelines and requirements to check before your PR can be merged:

• [x] There is an informative high-level description of the changes.
• [x] The description and/or commit message(s) references the relevant GitHub issue(s).
• [x] pre-commit is installed and set up.
• [x] The commit messages follow these guidelines.
• [x] The commits correspond to relevant logical changes, and there are no commits that fix changes introduced by other commits in the same branch/BR.
• [] There are tests covering the changes introduced in the PR.

Not sure how to write a test for this, or if that is even necessary. Let me know!

[PaulScemama]

I had trouble building the documentation myself, but I just used docutils to convert .rst to .html and then rendered the html to get an idea of what the changes looked like (since the changes were so small). However, I wouldn't think my local developer (and documentation) environment being troublesome would have an effect on these tests?

[brandonwillard]

I had trouble building the documentation myself, but I just used docutils to convert .rst to .html and then rendered the html to get an idea of what the changes looked like (since the changes were so small). However, I wouldn't think my local developer (and documentation) environment being troublesome would have an effect on these tests?

Sorry, there were unrelated docs and test issues that have just been resolved.

[PaulScemama]

Ready for review @brandonwillard @rlouf. No rush!