Proposals for cheat-sheet docs

[melroy89]

You accepted pull requests. So here you go 😆 .

I extended the cheat sheet with most used settings of app.ini.

Thanks!

Regards,
Melroy

[codecov-commenter]

Codecov Report

Merging #12946 into master will increase coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #12946      +/-   ##
==========================================
+ Coverage   42.83%   42.85%   +0.02%     
==========================================
  Files         662      662              
  Lines       73002    73002              
==========================================
+ Hits        31269    31286      +17     
+ Misses      36657    36645      -12     
+ Partials     5076     5071       -5     

Impacted Files	Coverage Δ
services/pull/pull.go	41.27% <0.00%> (+0.49%)	⬆️
models/error.go	34.85% <0.00%> (+0.50%)	⬆️
modules/git/repo.go	46.70% <0.00%> (+0.50%)	⬆️
modules/queue/workerpool.go	60.00% <0.00%> (+1.22%)	⬆️
modules/git/utils.go	77.04% <0.00%> (+3.27%)	⬆️
modules/indexer/stats/queue.go	76.47% <0.00%> (+11.76%)	⬆️
modules/indexer/stats/db.go	60.86% <0.00%> (+17.39%)	⬆️

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