Update installation documentation Issues 1199 and 1201

Along with some formatting and links added for user friendliness, I added text to clarify that the local instance of OpenHatch does not have user information in the SQLite database. Clarifies that user can add data to the database manually. Added link to Advanced Docs on Importing a data snapshot if the developer needs pre-populated data for development or testing purposes.

This should close #1199 and #1201.
"Python 2.x versions Python 2.6 or ..." sounds like it might have been a typo.