Adding base.html template
Abstracting base.html and rewriting category.html to inherit from base.html
Adding home page link to the base template
Updating other templates to use the base template
Adding the function of adding a page to the categories
Changing restricted path to use template
Chapter 10: Checking cookies functionality
Implementing client side cookies to track visits
Storting session data in server, only session ID in client
Adding about view and template
Adding visits count to the 'about' template