add RTD configuration

[zacharyburnett]

I also created a readthedocs.org entry under my account, and gave @spacetelescope, @WilliamJamieson, and @nden maintainer access. The PR builds should start to run when .readthedocs.yaml is in the master branch.

[codecov]

Codecov Report

Base: 0.00% // Head: 0.00% // No change to project coverage 👍

Coverage data is based on head (e67934e) compared to base (78eb1cc).
Patch has no changes to coverable lines.

Additional details and impacted files

@@          Coverage Diff           @@
##           master     #70   +/-   ##
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  Coverage    0.00%   0.00%           
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  Files          25      25           
  Lines        3072    3072           
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  Misses       3072    3072           

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[tapastro]

Wait, this repo has docs?

I'm afraid I don't know enough about RTD or workflows to be of much use in reviewing this PR.

[zacharyburnett]

Wait, this repo has docs?

I'm afraid I don't know enough about RTD or workflows to be of much use in reviewing this PR.

Oh I apologize, thanks anyway though! Mostly I just copied the RTD configuration from other repos

[WilliamJamieson]

Wait, this repo has docs?

I'm afraid I don't know enough about RTD or workflows to be of much use in reviewing this PR.

Apparently, but by the history they haven't been updated in two years. So they maybe not that useful.