docs: fix 'npm run build' + run 'npm audit fix'

[mistercrunch]

npm run build would fail because the mdxparser doesn't like the comments at the top.

Also ran npm audit fix as npm was reporting some issues.

[codecov-commenter]

Codecov Report

Merging #10995 into master will decrease coverage by 4.13%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #10995      +/-   ##
==========================================
- Coverage   65.77%   61.64%   -4.14%     
==========================================
  Files         815      815              
  Lines       38358    38498     +140     
  Branches     3607     3620      +13     
==========================================
- Hits        25231    23733    -1498     
- Misses      13019    14579    +1560     
- Partials      108      186      +78     

Flag	Coverage Δ
#cypress	?
#javascript	62.05% <ø> (+0.31%)	⬆️
#python	61.40% <ø> (-0.03%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
superset-frontend/src/SqlLab/App.jsx	0.00% <0.00%> (-100.00%)	⬇️
superset-frontend/src/explore/App.jsx	0.00% <0.00%> (-100.00%)	⬇️
superset-frontend/src/dashboard/App.jsx	0.00% <0.00%> (-100.00%)	⬇️
superset-frontend/src/explore/index.jsx	0.00% <0.00%> (-100.00%)	⬇️
superset-frontend/src/dashboard/index.jsx	0.00% <0.00%> (-100.00%)	⬇️
superset-frontend/src/setup/setupColors.js	0.00% <0.00%> (-100.00%)	⬇️
superset-frontend/src/chart/ChartContainer.jsx	0.00% <0.00%> (-100.00%)	⬇️
superset-frontend/src/setup/setupFormatters.js	0.00% <0.00%> (-100.00%)	⬇️
superset-frontend/src/explore/reducers/index.js	0.00% <0.00%> (-100.00%)	⬇️
superset-frontend/src/setup/setupPluginsExtra.js	0.00% <0.00%> (-100.00%)	⬇️
... and 204 more

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[willbarrett]

@mistercrunch this appears to need rebase, and for the license check to be fixed.