docs: added mathjax for rendering tex format as imgmath needs latex engine to run

[fnhirwa]

Before submitting

• Was this discussed/approved via a Github issue? (no need for typos and docs improvements)
• Did you make sure to update the docs?
• Did you write any new necessary tests?

What does this PR do?

Adding support to render latex math formulas, changing from imgmath to mathjax as imgmath requires latex engine to run.

related to Lightning-AI/pytorch-lightning#19633

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70%. Comparing base (cbbea35) to head (a5084e4).

Additional details and impacted files

@@         Coverage Diff         @@
##           main   #316   +/-   ##
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  Coverage    70%    70%           
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  Files         2      2           
  Lines       403    403           
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  Hits        284    284           
  Misses      119    119           

[fnhirwa]

@Borda Just a quick question:

I'm trying to build docs from this repository, but tutorials seem to fail on the main branch, when I try from the pytorch-lightning repository where this is added as a submodule the changes seem to work there, does it mean that if we update the submodule? I can see that the submodule branch is publication https://github.com/Lightning-AI/pytorch-lightning/blob/fadd2fccdc49e20d64db37fe3654116b4f1b9e49/.gitmodules#L4 updating the submodule will make tutorials render properly regarding math formulas.

Does this mean that the PR has to be merged to the publication branch?

Just an update built docs from the publication branch and it seems that it is the one we have to update. With your approval we will now close this PR and look at this one #317 on publication branch

[Borda]

Just an update built docs from the publication branch and it seems that it is the one we have to update. With your approval we will now close this PR and look at this one #317 on publication branch

yes when you clone this repo recursively you shall get the right branch

[fnhirwa]

https://github.com/Lightning-AI/pytorch-lightning/blob/fadd2fccdc49e20d64db37fe3654116b4f1b9e49/.gitmodules#L4
I did the same and got the

Then I think these changes have to be made on the publication branch as the git submodule is pointing to that branch from the PyTorch-lightning repo.