Add markdown support in organization description

[wULLSnpAXbWZGYDYyhWTKKspEQoaYxXyhoisqHf]

Similarly to how you can write some markdown in user profile description, you can now use the same feature in organization description.
As discussed in discord.
kudos to @mrsdizzie and @zeripath

visualization:

edit: proper kudos

[zeripath]

This seems fine to me

[codecov-io]

Codecov Report

Merging #13549 (089022e) into master (3cd00c3) will decrease coverage by 0.00%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master   #13549      +/-   ##
==========================================
- Coverage   42.17%   42.16%   -0.01%     
==========================================
  Files         696      696              
  Lines       76437    76439       +2     
==========================================
- Hits        32235    32230       -5     
- Misses      38918    38921       +3     
- Partials     5284     5288       +4     

Impacted Files	Coverage Δ
routers/org/home.go	65.59% <0.00%> (-1.45%)	⬇️
modules/charset/charset.go	68.53% <0.00%> (-4.50%)	⬇️
modules/git/utils.go	73.77% <0.00%> (-3.28%)	⬇️
models/gpg_key.go	53.33% <0.00%> (-0.58%)	⬇️
modules/git/repo.go	45.17% <0.00%> (-0.51%)	⬇️
services/pull/pull.go	40.78% <0.00%> (-0.50%)	⬇️
modules/indexer/stats/db.go	52.17% <0.00%> (ø)
models/error.go	35.72% <0.00%> (+0.50%)	⬆️
services/pull/check.go	49.63% <0.00%> (+0.72%)	⬆️
modules/util/timer.go	85.71% <0.00%> (+42.85%)	⬆️

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