Update installation doc
Update installation doc

1) Approval of Dan Armbrust's changes
2) Replace Settings section
3) Formatting & Cleanup

Apelon-VA/ISAAC,Apelon-VA/va-isaac-gui,DongwonChoi/ISAAC,vaskaloidis/va-isaac-gui,DongwonChoi/ISAAC,vaskaloidis/va-isaac-gui,DongwonChoi/ISAAC,Apelon-VA/va-isaac-gui,Apelon-VA/ISAAC,Apelon-VA/ISAAC