migrate some components to Mui5 new styling system (#72)

* - Changed the value in Manga from 960 to 900( md breakpooint)
- The CicularLoader in About  and Reader screens is now centered to the whole screen
- Changed relative imports in About screen to absolute imports
- removed changed styles from Browse Screen, PageNumber

* Migrated Source Card, Extension Card and LoadingPlaceHolder to MUI system

* Migrated CategorySelect and LandSelect to using the sx prop

* migrated ReaderNavbar to mui 5

* - Removed Unused Styles from Page
- Migrated DoublePage, doublePagedPager, PagedPager, Vertical Pager and Horizontal Pager.

* Replaced style prop with sx prop

* removed useStyles completely from the project except for the Manga Screen

* added a comment

* Fixed the Source Card Buttons padding

* Removed the trailing backspace

Co-authored-by: Sascha Hahne <ntbm@users.noreply.github.com>

Co-authored-by: Sascha Hahne <ntbm@users.noreply.github.com>

src/components/library/LibraryOptions.tsx

@@ -11,16 +11,17 @@ import FilterListIcon from '@mui/icons-material/FilterList';
 import { Drawer, FormControlLabel, IconButton } from '@mui/material';
 import useLibraryOptions from 'util/useLibraryOptions';
 import ThreeStateCheckbox from 'components/util/ThreeStateCheckbox';
+import { Box } from '@mui/system';
 
 function Options() {
     const {
         downloaded, setDownloaded, unread, setUnread,
     } = useLibraryOptions();
     return (
-        <div style={{ display: 'flex', flexDirection: 'column' }}>
+        <Box sx={{ display: 'flex', flexDirection: 'column' }}>
             <FormControlLabel control={<ThreeStateCheckbox name="Unread" checked={unread} onChange={setUnread} />} label="Unread" />
             <FormControlLabel control={<ThreeStateCheckbox name="Downloaded" checked={downloaded} onChange={setDownloaded} />} label="Downloaded" />
-        </div>
+        </Box>
     );
 }