Switching over to mystjs

[bsipocz]

This is a tracking issue of items that are needed to be addressed before we can switch over to use mystjs. Please do edit the list below

[ ] - ...
[ ] - Deploy to gh-pages

See related issues jupyter-book/mystmd#1270 and jupyter-book/mystmd#1269 and links therein

[bsipocz]

Now that I successfully switch the IRSA-tutorials to use mystmd; shall I go ahead and do it here, too? Is there anything that we could salvage from the work we did at the summit last year or at this point it's better to start from scratch?
(I suppose the toc would be useful, but better to start from the beginning regarding the CI config files)

[rossbar]

Now that I successfully switch the IRSA-tutorials to use mystmd; shall I go ahead and do it here, too?

I'm in favor of doing so - I think there are still some rough edges but IMO the best way to sand them down is with real-world use-cases, which numpy-tutorials certainly is! +1 from me!