[Docs] Generate man pages

[6543]

close #11476
fix #11399

[6543]

@bagasme would you like to have a look at it

[jolheiser]

This should probably leverage the existing docs command with the man flag.

[codecov-io]

Codecov Report

Merging #13901 (ed31084) into master (487f2ee) will decrease coverage by 0.00%.
The diff coverage is 42.54%.

@@            Coverage Diff             @@
##           master   #13901      +/-   ##
==========================================
- Coverage   42.21%   42.21%   -0.01%     
==========================================
  Files         767      771       +4     
  Lines       81624    82068     +444     
==========================================
+ Hits        34458    34641     +183     
- Misses      41531    41779     +248     
- Partials     5635     5648      +13     

Impacted Files	Coverage Δ
models/migrations/migrations.go	2.59% <ø> (ø)
models/migrations/v166.go	0.00% <0.00%> (ø)
models/migrations/v172.go	0.00% <0.00%> (ø)
models/migrations/v173.go	0.00% <0.00%> (ø)
models/session.go	0.00% <0.00%> (ø)
models/user.go	53.05% <ø> (+0.38%)	⬆️
modules/context/context.go	58.05% <0.00%> (-0.45%)	⬇️
modules/indexer/code/elastic_search.go	1.72% <0.00%> (-0.02%)	⬇️
modules/migrations/github.go	77.77% <0.00%> (-1.99%)	⬇️
modules/session/virtual.go	60.20% <0.00%> (-1.26%)	⬇️
... and 54 more

---

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[lunny]

Is this ready to review?

[6543]

@lunny sure - for the whole time

[jolheiser]

Consider leverage the existing docs command with the man flag.

[6543]

@jolheiser removed it and just leave a TODO back there ...