Refresh content about Fedora Workstation Guide

The main thing done here is re-arranging. I separate four main parts:

install---update---driver---asusctl

and pull them at the beginning of the guide, which will make the reading process easier. Plus some more tips and notes to make it clear.

Then I split and move the custom kernel stuff to the later part, which avoids confusing/misleading.

All changes are checked carefully to make sure nothing goes wrong. and verify this by completely following the guide to fresh install Fedora.