* Added the back button to the main Ui
* Changed the naviation in the reader ui so that when the next or previous chapter links are clicked, instead of adding the a new history entry, it will replace the current History entry and rereder the Reader component
* - Made changes so that if history is of length 1 then the backbutton will take you to /library
- made use of the startsWith method so that if we use url for the saving the last viewed category there won't be a need to change this
- changed a few relative imports to absolute imports
* Back button won't show for any route that has an icon in the sidebar
* sidebar is working in the desktop mode
Still needs a few styling imporvements
* - made the color of the sidebar same as the Navbar
- increased font size in when using on a non-mobile device
* changed the main view padding to 64px
* Settings changed a few values to be based on the Theme object
* - Added ToolTip
- Fixed a Typo
- Renamed mobileDevice to isMobileWidth
- changed text property to Title in NavbarItem
* increased tooltip fontsize
