Markdown support for descriptions

[local-minimum]

Doesn't support headings (probably good since it would break layout without some css considerations). Supports sub and super scripting. Applies to both project and experiment descriptions.

[codecov-io]

Codecov Report

Merging #384 into master will increase coverage by 0.02%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #384      +/-   ##
==========================================
+ Coverage   40.72%   40.75%   +0.02%     
==========================================
  Files         198      199       +1     
  Lines       16855    16858       +3     
  Branches     2942     2942              
==========================================
+ Hits         6865     6870       +5     
+ Misses       9575     9554      -21     
- Partials      415      434      +19

Impacted Files	Coverage Δ
.../ui_server_data/js/src/components/ProjectPanel.jsx	100% <ø> (ø)	:arrow_up:
...r_data/js/src/components/ExperimentPanel/index.jsx	96.96% <ø> (ø)	:arrow_up:
...omatic/ui_server_data/js/src/components/Markup.jsx	100% <100%> (ø)
scanomatic/ui_server/data_api.py	9.65% <0%> (ø)	:arrow_up:
scanomatic/qc/phenotype_results.py	0% <0%> (ø)	:arrow_up:
scanomatic/io/source.py	18.08% <0%> (ø)	:arrow_up:
scanomatic/data_processing/phases/features.py	17.23% <0%> (ø)	:arrow_up:
scanomatic/ui_server/tools_api.py	8.77% <0%> (ø)	:arrow_up:
scanomatic/data_processing/phenotyper.py	27.51% <0%> (ø)	:arrow_up:
scanomatic/ui_server/general.py	22.41% <0%> (ø)	:arrow_up:
... and 2 more

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[local-minimum]

The solution needs setting dangerous html but markdown-it should be safe since the markdown module is not set to allow html-tags:

https://markdown-it.github.io/markdown-it/#MarkdownIt.new

[local-minimum]

I did this to see what your thought were on it and you might be right that <pre> is sufficient for now. I thought this markdown package did sanatize, but you are right we'd probably want to check it if we decided to do it... I'll close this PR and one of us make's the descriptions <pre> and make sure it looks decent.