Lab04

See merge request !1

Updated the 'Per Author's Details' page to include a button to edit the author and Implemented the 'Edit Author' page using UpdateView and configuring urls.py

Updated the 'Per Book's Details' page to include a button to edit the book and Implemented the 'Edit Book' page using UpdateView and configuring urls.py

Updated the Homepage to include a link to add authors and Implemented the 'Add New Author' page using CreateView and configuring urls.py

Updated the Homepage to include a link to add books and Implemented the 'Add New Book' page using CreateView and configuring urls.py

Updated models.py to import the 'reverse' function and update the 'get_absolute_url' functions appropriately.