Refactor/download queue and cleanup visuals overall (#202)

* Move context providers and configuration providers to separate component, extract theme to separate file

* Use custom palette color instead of direct colors

* Replace different clicable things with CardActionArea to get transition and links

* Refactor DownloadQueue, update layout, unify all the download progress indicators

* Unify active filter indicator

* Use divider instead of hr

* Fix background color in extensions light theme

* Fix thumbnail overlay in library screen list view

* Don't show download button on downloaded updates

src/components/navbar/navigation/MobileBottomBar.tsx

@@ -16,7 +16,7 @@ const BottomNavContainer = styled('div')(({ theme }) => ({
     left: 0,
     height: theme.spacing(7),
     width: '100vw',
-    backgroundColor: theme.palette.mode === 'light' ? theme.palette.grey[100] : theme.palette.grey[900],
+    backgroundColor: theme.palette.custom.light,
     position: 'fixed',
     display: 'flex',
     flexDirection: 'row',