Convert UI menu from tables to divs

[alulsh]

Right now the UI menu uses HTML tables - <table>, <tr>, and <td> elements.

Tables should only be used for tabular data, like that which you'd store in an Excel spreadsheet. Tables shouldn't be used to UI elements.

Let's convert the HTML table to use <div> elements instead. We can properly style the UI widget using CSS.

/cc @hareno44