* 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
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