Login is not really using <form> properly, hacked around problems with submitting form so far. Removed more debugging console.logs that were no longer useful. There is a problem when the user refreshes the page & they're already logged in. Things get added to the DOM that shouldn't be added, and the dropdown for selecting lists is empty.
Removed the showIntro() function because it's functionality could be put into another function where it made more sense.
Modified JS to remove some greeting or prompt text depending on user actions. When the page is refreshed, the lists are not being fetched. There is an issue with the function saveList() and some <li> nodes not having text in them. This is causing an error where jQuery is trying to evaluate the length of undefined.