feat: Update Angular to v12

Closes #195 (closed)

Used https://update.angular.io/?l=2&v=7.2-12.0

TODO

• Fix build errors (especially ngrx)
• Update dependencies
• Update from Angular 11 to Angular 12
• Check Stylus Deprecation Warning
• Check compilation warnings
• Fix missing padding in app bar and profile settings panels
• Fix tests
• Fix avatar upload
• Fix commitment style bug
• Test
• Switch to pnpm -> Moved to #269 (closed)

notes:

• emojione 3 -> joypixels
• angular-linky -> ngx-linky + autolinker
• custom message sanitizer pipe with sanitize-html package
• stylus is deprecated, but still works
• changed pipelines to use builder images to skip package installation
• tslint (deprecation warning) -> eslint
• momentjs is becoming legacy: https://momentjs.com/docs/#/-project-status/
• moved .env into server dir because it's only used there and now included in Dockerfile