Merge pull request #9 from Henry-Azer/refactor/structure

[Refactor] get rid of categories screen

[Refactor] signin redirect

[Refactor] user recommended books screen

[Refactor] splash and home flow

[Refactor] user rated books screens

[Refactor] book categories screens

[Refactor] book info screens

[Refactor] user welcome screens

[Add] to app text styles

[Refactor] app bar and navigation bar

[Refactor] screens routes and cubit providers

[Add] to en localizations

Merge pull request #8 from Henry-Azer/implement/bookmark

add physics attribute to make gridview scrollable