Includes:
- Created css variables in JS.
- Added JS helpers.
- Replaced old sidebar by the "APP Bar" component from Material UI.
- Replaced logo by the new version.
- Added Avatar icon.
- Added Info Icon.
- Added Information Dialog, where the user can 'copy to the clipboard' the verdaccio commands.
- Added Verdaccio website documentation link.
- Added Drop Down Menu on the right side with a logout option
* fix: login without reload (#678) (#679)
* fix: implements code review suggestions (#914)
* refactor: adds scope to the app
* refactor: handles null value from localstorage for username
* refactor: removes text type from <Input />
* refactor: replaces isNull with isNil
* refactor: improves makeLogin method
* refactor: adds error from api constant
* fix: updates error using API_ERROR constant in tests
* refactor: updates regex for moduleMapper in jest config
