preview documentation PRs

[aaronpeikert]

This PR adds a GHA that renders the documentation for PRs from documentation/branches.
They are availible under a different link that is posted as a comment in the PR.

[aaronpeikert]

See here for an example: aaronpeikert/StenoGraphs.jl#42

[github-actions]

Docs can be previewed here: https://structuralequationmodels.github.io/StructuralEquationModels.jl/previews/PR137

[github-actions]

Docs can be previewed here: https://structuralequationmodels.github.io/StructuralEquationModels.jl/previews/PR137

[codecov]

Codecov Report

Merging #137 (5bc5fc4) into main (9ef40a6) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #137   +/-   ##
=======================================
  Coverage   67.25%   67.25%           
=======================================
  Files          50       50           
  Lines        2361     2361           
=======================================
  Hits         1588     1588           
  Misses        773      773           

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[Maximilian-Stefan-Ernst]

With regards to our workflow, should this be merged into main or devel?

[aaronpeikert]

Its an action, so it must be merged into main to take effect. But it should of course than be merged also in devel.