clarify id instructions

[Erin-Cecele]

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Yes: thegetty/quire#869

Please describe the goal of this pull request and the changes that were made.

Update recently revised guidelines to include "cannot start with a number / can only start with a lowercase letter".

Additional Comments

[geealbers]

Do we talk about ids in contexts other than figures elsewhere in the docs? I think we probably should be consistent everywhere that they should always be lowercase and use hyphens and nothing else.

[Erin-Cecele]

well ... now that I think of it, citation id's do have spaces in them. I tested numbers, underscores, and periods but I guess I didn't test spaces within figure ids. Is there any reason a space would work in a citation id versus a figure id? Or is your point more that we should keep the messaging uniform across id types regardless?

[Erin-Cecele]

@geealbers per our meeting this morning, can I merge this? I opened two additional issues to keep track of the work not yet done: #715 and #716.

[geealbers]

Yes, good to merge