[Mobile - 15] Unify home screen

[simon-the-shark]

After few merges, someone needs to unify some things in homescreen and fix few visual bugs and problems with paddings.

Tasks:

1. Unify usage of NetworkCachedImage
2. Fix BigPreviewCard
3. Counter padding
4. Paddings between all sections: (check if the same everywhere as in Figma - probably not)
5. Left side padding when horizontal scrolling - smaller or ideally some fading out effect/gradient/shadow
6. Whether buttons should have splash (visual clicking effects)
7. Generally, section header unification (one common widget)
8. "wydział wydział" and background images probably should have less opacity (?). Ideally unify all source images to totally white and then add unified opacity in the app.
9. SplashScreen as placeholder everywhere?
10. Group repositories to corresponding folders
11. Maybe group some widgets to folders related to their sections (?) (When there's many widget related to one section)
12. Check background shadows everywhere
13. padding on bottom of the page
14. lighter shadows on this
15. Loading effect (?)

[simon-the-shark]

Branch is already created here, some volounteer can take on with this task: https://github.com/Solvro/topwr-mobile/tree/mobile-15