Attempt doc preview with mystjs.

[rossbar]

No description provided.

[rowanc1]

Looks like the site is ~working, however, internal links don't point to the .html and there is no auto redirect for these on the service as is common on most static site generators (including github pages).

Preview:
https://output.circle-artifacts.com/output/job/2f17c17e-a680-4e5c-a008-5460b25130ac/artifacts/0/_build/html/index.html

Bug/feature request on CircleCI:
https://discuss.circleci.com/t/circle-artifacts-com-not-using-index-html/320

We can also potentially address this in MyST, but the fix is going to be cumbersome.

[rossbar]

Thanks for diving into this @rowanc1 , this is very helpful!

[rossbar]

FWIW I left the main components of the deployment workflow commented out - to be addressed separately!

[InessaPawson]

The docs in preview look stunning!

[bsipocz]

We should probably write up a tracking issue to see a list of TODO items about the missing tasks that are required to be done before we can switch over to this in the main branch.