Add link to shop in docs

[techknowlogick]

Replaced link to code.gitea.io as that subdomain isn't meant for human consumption, but rather for our vanity go import URLs
Only replaced link for english, open to adding links for other languages if anyone is able/willing to add them

[codecov-io]

Codecov Report

Merging #13864 (2ff6db7) into master (4a510e0) will increase coverage by 0.11%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #13864      +/-   ##
==========================================
+ Coverage   42.14%   42.26%   +0.11%     
==========================================
  Files         708      708              
  Lines       77190    77190              
==========================================
+ Hits        32535    32627      +92     
+ Misses      39307    39197     -110     
- Partials     5348     5366      +18     

Impacted Files	Coverage Δ
modules/process/manager.go	72.50% <0.00%> (-2.50%)	⬇️
modules/charset/charset.go	68.53% <0.00%> (-2.25%)	⬇️
services/gitdiff/gitdiff.go	69.05% <0.00%> (-1.94%)	⬇️
modules/log/event.go	59.90% <0.00%> (-1.89%)	⬇️
models/error.go	38.66% <0.00%> (+0.48%)	⬆️
modules/git/repo.go	46.23% <0.00%> (+0.50%)	⬆️
services/pull/pull.go	41.17% <0.00%> (+0.98%)	⬆️
services/mailer/mail.go	61.29% <0.00%> (+1.07%)	⬆️
services/pull/check.go	51.09% <0.00%> (+2.18%)	⬆️
modules/notification/notification.go	86.60% <0.00%> (+2.67%)	⬆️
... and 8 more

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