Add a main page and styles

[prem-baj]

Add a main page with a descriptive title and maybe some images. We also need a bar to display either the:

• "Login" and "Register" buttons, if the user is not logged in
• "Cars", "Book a car", "My orders", if the user is logged in You can use the Django template tags to achieve that, sth like this:

We also need to use Django template inheritance, to reuse the app bar & eventually the footer on all the pages, instead of repeating the code. (https://levelup.gitconnected.com/django-template-inheritance-and-reusability-e97b0fed8bcc) But let's leave it for later when the rest of the pages will be created.

[NikitaJaiswal77]

@prem-baj i want to contribute