Refactor

[Hareesh-Nandigrama]

1. All imports must be in relative format
2. All colors used must be in the same file colors.dart
3. Remove weak warnings in all files found by flutter lint
4. Discard the textstyles in styles.dart and follow the convention used in onestop
5. The styles.dart should only contain box decorations
6. In all the pages where the keyboard is used, it should be dismissable by tapping outside
7. All the files and folders should follow the naming convention