install.md:ref webserver configs in webconfigs/

in the web server setup section of the docs, I reference the webconfigs
directory which I plan on creating with sample web server configs,
webconfigs/

INSTALL.md

change minutes to seconds, it doesn’t take that long to import a SQL
dump.
talk about next steps after installing everything

INSTALL.md: needs pear Image_GraphViz

note that we need pear’s Image_GraphViz for visualizing AS relationships