Update INSTALL.md
Update INSTALL.md

Elaborate that `collectstatic` is only necessary if you are running an instance of Kive through Apache (as a production webserver).
Switched to using tab-indentation for code blocks instead of triple quote markdown, so the file looks better when viewed as plain text.
cfe-lab/Kive,cfe-lab/Kive,cfe-lab/Kive,cfe-lab/Kive,cfe-lab/Kive