Fixes to issues with the main build identified in demo

Fixed issues in the flask app including image referencing, unimplemented buttons, radio button updating, broken sidebar links, etc. Modified the install script and service templates to purge preinstalled flask and use the pip installed version. Implemented an nginx reverse proxy so that users can navigate to the browser interface without specifying the port number (80 now redirects to 5000). Added the logo script back into the assets folder.