i need to commit more: added welcome, fixed x-axis scrolling, styled moda...

A whole bunch of stuff...A terrible weekend for committing the correct way! Added welcome, styled user-input modal, styled add-message area (and added username), commented out the sanitizing bit b/c it making a lot of stuff look super weird, old messages are being prepended and new ones appended, scroll should now start at bottom of message stream. Still having trouble with fetching messages on an interval:(