feature/Skeleton Screen Instead of Loading Widget for dashboard

[SalihSaygi]

Skeleton Screen is used to put a screen while the data is being fetched.
Youtube Example:

To do this you can follow this tutorial: https://www.youtube.com/watch?v=cg_tmJBisp8
or you can use another way to implement it using some kind of library.

Here is the Github repo of the tutorial: https://github.com/iamshaunjp/react-skeleton-screens/tree/lesson-7