Support for wider screens

[ekuznetsov139]

All pages on https://rocm-documentation.readthedocs.io/en/latest/index.html are limited to approximately 800 pixels in width and there's no apparent way to make the text wider (I can zoom in but that just makes the font larger, the amount of information per line stays the same).

This is a problem for tables, because, for example, most tables in the Vega ISA page are too wide to fit into 800 pixels.

Documentation ends up looking like so