Create Readthedocs using GitHub Actions v3

[martinvonk]

Short Description

https://github.com/dfm/rtds-action

Checklist before PR can be merged:

• closes issue Removed RTD docs build as required status check for PRs  #590, [ENHANCEMENT] Question: move running of notebooks to Github Actions instead of ReadtheDocs? #458

[codacy-production]

Coverage summary from Codacy

Merging #594 (3d60c95) into dev (1938128) - See PR on Codacy

Coverage variation	Diff coverage
✅ +0.00% (target: +0.00%)	∅

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (1938128)	4941	3596	72.78%
Head commit (3d60c95)	4941 (+0)	3596 (+0)	72.78% (+0.00%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#594)	0	0	∅ (not applicable)

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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[martinvonk]

Installing future (problems #578) now works again magically. While this was previously a problem whith RTD. Probably in the future we can still switch building the RTD using GitHub actions but for now we can close this again and leave things as they were.