docs: Clean up documentation.

[dianakhuang]

• Removed out of date known issues.
• Cleaned up workflow commands.
• Removed references to out of date Pycharm instructions.

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I've completed each of the following or determined they are not applicable:

• Made a plan to communicate any major developer interface changes (or N/A)

[rgraber]

Why are we replacing the lms-* commands with dev.*.lms ? I usually use lms-*

[dianakhuang]

Mostly this is the better-supported convention? But I don't have strong feelings about it and can go either way.

[rgraber]

Mostly this is the better-supported convention? But I don't have strong feelings about it and can go either way.

Actually this also brings up a question for me about why we have both and if that's more confusing than helpful. But I guess it makes sense to use dev.action.service since that's how it's described in the makefile.

[dianakhuang]

I'm not sure why we introduced a new one, but I feel like the lms- commands were kept around for backwards compatibility.

[rgraber]

I know we're looking for quick wins, so approving, but in the future it might be useful to have examples of what kinds of changes require a full restart

[rgraber]

I know we're looking for quick wins, so approving, but in the future it might be useful to have examples of what kinds of changes require a full restart

Somehow I completely skipped over the examples that were already there. Made a request to add a line about how runserver occasionally just stops picking up changes because it doesn't feel like it.