add mermaid.js and mathjax to npm deps

[2bndy5]

• mermaid dist is copied to built docs' static files.
• mathjax dist is copied to built docs' static files if the sphinx.ext.mathjax is enabled.
  mathjax script tag attributes intentionally exclude async.

resolves #150

[jbms]

I think rather than download mermaid.js when the docs are built, we could just add it as a dependency to packages.json and then include it in the built package / wheel with the other javascript bundles (but not bundle it). We can do the same thing for mathjax.

[2bndy5]

I had considered that as well, but I wasn't sure if changing the package.json was a welcome change. I'll rework this and get back to you...

I'm still not convinced that the mathjax lib needs to be handled by this theme. Sphinx' mathjax_path can be used by users to do the same thing that was suggested. Maybe I'm missing something.

[jbms]

It is true that mathjax isn't really related to this theme. Perhaps it would be better if Sphinx itself included a version of mathjax so that there is no dependency on external resources by default. But I'm not sure how likely that is to go through...

Particularly since we may soon provide a way to use mathml instead, I think it is reasonable to just ignore mathjax for now...

But in general providing a way to avoid any dependence on external resources is a useful feature, and one that can be a bit annoying for users to implement themselves.

[2bndy5]

Perhaps it would be better if Sphinx itself included a version of mathjax so that there is no dependency on external resources by default

Oh, you're focused on the default behavior. 🤦🏼 That would be so easy to just change the default value of mathjax_path if the config has the attr defined... I'm not sure where we'd document this adjustment. Maybe it can be mentioned with the solution for #233 .

[jbms]

Regarding mathjax, now that all major browsers support MathML, it may make sense to explore whether we can just recommend using mathml instead of mathjax, since if it works, it would require no additional libraries and would render without a delay.

This comment describes how it might simply require modifying the docutils.conf file in the doc root directory:

sphinx-doc/sphinx#6092 (comment)

Not sure if anyone has actually tested that, though.

[2bndy5]

I was going to approach the #233 separately. The newer MathML feature does look much more appealing, but this work is more like retrofitting when it comes to mathjax use. The sphinx dev cycle isn't too slow (for the most part), so hopefully there will be more development/testing with MathML in Sphinx by the time we get around to #233 .

[jbms]

Can you also ensure that the licenses for these two packages are added to the generated license file (see tools/buil.d/transform/index.ts),; the existing logic only includes packages that are bundled by esbuild.

[2bndy5]

Can you also ensure that the licenses for these two packages are added to the generated license file

The mermaid dist includes a copy of the License alongside the mermaid.min.js* files. Did you want to keep that in the bundles folder as well? Or is it sufficient to have it only in the generated LICENSE file?

[jbms]

Can you also ensure that the licenses for these two packages are added to the generated license file

The mermaid dist includes a copy of the License alongside the mermaid.min.js* files. Did you want to keep that in the bundles folder as well? Or is it sufficient to have it only in the generated LICENSE file?

Keeping a copy of the license there as well makes sense.

[jbms]

Thanks!