Fix mobile view for Login and Index pages

[Varunvaruns9]

Add proper styling for mobile views of both Login and Index pages.

Navigation bar of index page:

Login page:

Start with index page, it is easier.

[Qoyyuum]

Login page

That + button was confusing. I didn't know that was a Registration button lol. Where do you want that button to be in a smaller media screen?

Index page

Just throwing an idea here. Convert tabs and that logout button into a burger menu?

[Varunvaruns9]

The plus button can be made smaller and then shifted a little to the left. It would look better if the whole login/register card was a bit smaller.

I find the tabs very nice to use in mobile view and using burger menu to switch is not very appealing. The logout button can be put anywhere, as long as it can be accessed :D