Change all license headers to comply with REUSE specification.

Fix #16132

Co-authored-by: flynnnnnnnnnn <flynnnnnnnnnn@github>
Co-authored-by: John Olheiser <john.olheiser@gmail.com>

Show which Chroma Lexer is used to highlight the file in the file
header. It's useful for development to see what was detected, and I
think it's not bad info to have for the user:

<img width="233" alt="Screenshot 2022-11-14 at 22 31 16"
src="https://user-images.githubusercontent.com/115237/201770854-44933dfc-70a4-487c-8457-1bb3cc43ea62.png">
<img width="226" alt="Screenshot 2022-11-14 at 22 36 06"
src="https://user-images.githubusercontent.com/115237/201770856-9260ce6f-6c0f-442c-92b5-201e5b113188.png">
<img width="194" alt="Screenshot 2022-11-14 at 22 36 26"
src="https://user-images.githubusercontent.com/115237/201770857-6f56591b-80ea-42cc-8ea5-21b9156c018b.png">

Also, I improved the way this header overflows on small screens:

<img width="354" alt="Screenshot 2022-11-14 at 22 44 36"
src="https://user-images.githubusercontent.com/115237/201774828-2ddbcde1-da15-403f-bf7a-6248449fa2c5.png">

Co-authored-by: delvh <dev.lh@web.de>
Co-authored-by: Lauris BH <lauris@nix.lv>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: John Olheiser <john.olheiser@gmail.com>

* Handle keyword search error when issue indexer service is not available

* Implement automatic disabling and resume of code indexer queue

Use check attribute code to check the assigned language of a file and send that in to
chroma as a hint for the language of the file.

Signed-off-by: Andrew Thornton <art27@cantab.net>

* feat: add type query parameters for specifying precise search

* feat: add select dropdown in search box

Co-authored-by: Lauris BH <lauris@nix.lv>
Co-authored-by: techknowlogick <techknowlogick@gitea.io>

* Server-side syntax hilighting for all code

This PR does a few things:

* Remove all traces of highlight.js
* Use chroma library to provide fast syntax hilighting directly on the server
* Provide syntax hilighting for diffs
* Re-style both unified and split diffs views
* Add custom syntax hilighting styling for both regular and arc-green

Fixes #7729
Fixes #10157
Fixes #11825
Fixes #7728
Fixes #3872
Fixes #3682

And perhaps gets closer to #9553

* fix line marker

* fix repo search

* Fix single line select

* properly load settings

* npm uninstall highlight.js

* review suggestion

* code review

* forgot to call function

* fix test

* Apply suggestions from code review

suggestions from @silverwind thanks

Co-authored-by: silverwind <me@silverwind.io>

* code review

* copy/paste error

* Use const for highlight size limit

* Update web_src/less/_repository.less

Co-authored-by: Lauris BH <lauris@nix.lv>

* update size limit to 1MB and other styling tweaks

* fix highlighting for certain diff sections

* fix test

* add worker back as suggested

Co-authored-by: silverwind <me@silverwind.io>
Co-authored-by: Lauris BH <lauris@nix.lv>

Move langauge detection to separate module to be more reusable

Add option to disable vendored file exclusion from file search

Allways show all language stats for search

* Refactor code indexer

* fix test

* fix test

* refactor code indexer

* fix import

* improve code

* fix typo

* fix test and make code clean

* fix lint

* add global code search on explore

* fix bug when no anyone public repos

* change the icon

* fix typo and add UnitTypeCode check for login non-admin user

* fix ui description when no match

Fixes #3383.

Indexed search of repository contents (for default branch only)