New CSS linter which is much more powerfull than the previous one.
Configuration is default but I had to remove a few rules that were
throwing too many or weird errors.

More importantly, the linter will exit with code 1 on errors so now our
build will fail if the CSS linter fails which should eliminate linter
errors being introduced without notice.

* UI: Make document body a flexbox

Fixes: https://github.com/go-gitea/gitea/issues/6118

* ie11 fixes

* increase padding to 80px

* add flex-grow

* Added basic heatmap data

* Added extra case for sqlite

* Built basic heatmap into user profile

* Get contribution data from api & styling

* Fixed lint & added extra group by statements for all database types

* generated swagger spec

* generated swagger spec

* generated swagger spec

* fixed swagger spec

* fmt

* Added tests

* Added setting to enable/disable user heatmap

* Added locale for loading text

* Removed UseTiDB

* Updated librejs & moment.js

* Fixed import order

* Fixed heatmap in postgresql

* Update docs/content/doc/advanced/config-cheat-sheet.en-us.md

Co-Authored-By: kolaente <konrad@kola-entertainments.de>

* Added copyright header

* Fixed a bug to show the heatmap for the actual user instead of the currently logged in

* Added integration test for heatmaps

* Added a heatmap on the dashboard

* Fixed timestamp parsing

* Hide heatmap on mobile

* optimized postgresql group by query

* Improved sqlite group by statement

* reset to master

* build css

* Fixed spacing

* Implementation of all repositories of a user from user->settings

* Update message when no repository found

* Update according to comments

* Change UI to have a better look

* improved user repositories UI

* Remove point column on ssh key setting page

* Remove un-used css

* Some cleaning

* Use octicon-key

* Improve user openid list CSS and regenerate CSS

* i18n button titles

* Improvements on notification page layout

* Notification count badge fixes

* Make table <tr> clickable

* Fix octicon aligment

* Fix use of AppSubUrl

* Use relative URLs

* Notifications - Mark as read/unread

* Feature of pinning a notification

* On view issue, do not mark as read a pinned notification

- User profile un/follow
- List user's followers/following

This does not change any content and generated gogs.css is still the same.