Improve layout of tabs

[stropitek]

Before:

Now:

I think it would be nice to bring the horizontal separator line back and decrease the space between the tabs and the tab content.

You might want to use something similar to the "fill height" example in the docs:

[wadjih-bencheikh18]

I used navbar component

[wadjih-bencheikh18]

I used navbar blueprintjs component

[stropitek]

Here are some comments. It's probably not enough and there are probably other ways to make it look good so feel free to try other things. Right now the layout looks a bit all over the place.