Feature - #3031 - search for org repos

[richmahn]

Adds the search form to the Org home page like it is for the User home page to search and sort repos of the Org. Addresses #3031

Credit goes to @techknowlogick who made most all these edits in the closed PR #3081. Only updates I made were for the new sort options and new way to handle errors.

To test:
Check out branch, generate build, run gitea web, make a new org in your instance of Gitea and add multiple repos, staring and forking some of them. Then use the Search and Sort form on the Org home page.

[codecov-io]

Codecov Report

Merging #5986 into master will decrease coverage by 0.03%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #5986      +/-   ##
==========================================
- Coverage   38.77%   38.73%   -0.04%     
==========================================
  Files         332      332              
  Lines       48942    48992      +50     
==========================================
  Hits        18975    18975              
- Misses      27220    27269      +49     
- Partials     2747     2748       +1

Impacted Files	Coverage Δ
models/org.go	68.61% <0%> (-0.7%)	⬇️
routers/user/home.go	36.6% <0%> (-4.56%)	⬇️

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[techknowlogick]

Thanks for working on this 😄

I'd give this code 5/5 ⭐️s, however since I was involved in this I'll abstain from reviewing.

[lunny]

@richmahn thanks for your PR. Could you give some screenshots?

[richmahn]

@lunny Screenshots:

Org home page without any search and default sort of recently updated

Org home search for fr_ with default sorting of recently updated

Org home search for fr_ with sort of most forks

Org home search for fr_ with sort of most stars

[richmahn]

Ok, ready to merge (fixed the retaining of the sort order when changing the search query)