Remove markdown autofixing on precommit hook

[Hypnosphi]

It seems to be completely broken. If I commit something to README.md it just hangs — but that's not the worst part. If I commit both README.md and CONTRIBUTING.md at the same time, the contents of the former are replaced with those of the latter: 2f53feb#diff-04c6e90faac2675aa89e2176d2eec7d8

[codecov]

Codecov Report

Merging #1964 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1964   +/-   ##
=======================================
  Coverage   21.38%   21.38%           
=======================================
  Files         262      262           
  Lines        5757     5757           
  Branches      686      689    +3     
=======================================
  Hits         1231     1231           
+ Misses       4015     4005   -10     
- Partials      511      521   +10

Impacted Files	Coverage Δ
app/vue/src/server/utils.js	0% <0%> (-53.58%)	⬇️
addons/knobs/src/components/PropForm.js	8.51% <0%> (ø)	⬆️
lib/ui/src/modules/ui/libs/hierarchy.js	48.8% <0%> (ø)	⬆️
lib/ui/src/modules/api/actions/api.js	50.47% <0%> (ø)	⬆️
...s/left_panel/stories_tree/tree_decorators_utils.js	45.23% <0%> (ø)	⬆️
...es__/update-addon-info/update-addon-info.output.js	0% <0%> (ø)	⬆️
addons/storyshots/src/storybook-channel-mock.js	0% <0%> (ø)	⬆️
.../ui/src/modules/ui/components/layout/dimensions.js	15.62% <0%> (ø)	⬆️
lib/ui/src/libs/key_events.js	23.25% <0%> (ø)	⬆️
addons/info/src/components/Props.js	36.36% <0%> (ø)	⬆️
... and 15 more

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[dangreenisrael]

@Hypnosphi Should this also be done on 3.3 and new-docs?

[Hypnosphi]

@dangreenisrael yes