pinned version of nbconvert has problems with HTML blocks in markdown

[itcarroll]

The nbconvert package is pinned to version 6.5.3:

hub-image/environment.yml

Line 48 in 03a26b8

- nbconvert==6.5.3

As a result, the mistune package version is ... quite outdated.

As a result, certain markdown content (particularly HTML blocks) does not get converted to HTML correctly.

Can nbconvert be unpinned? I don't see a reason it is pinned, and in NASA-Openscapes hub it is not present at all (comes in from jupyter-server, I think.). I've just tried a conda update -n notebook -c conda-forge --all and it happily upgrades nbconvert to "7.16.4". And the upgrade solves my markdown rendering problem.

[weiji14]

Hi @itcarroll, I've opened up a PR at #117 to upgrade nbconvert to 7.16.4. See if that looks ok and we can merge that in.