Minor fix
Removed note per https://github.com/Versal/sdk/pull/14/files#r11280956

This should never happen, if someone runs into this lets hear about it and find out why this happens. It seems that npm recommends against it (although this is a 3 year old thread): https://stackoverflow.com/questions/4938592/how-why-does-npm-recommend-not-running-as-root
Combined and cleaned up versal create descriptions
Combined INSTALL and USAGE and cleaned up a bit
More text tweaks