Fix the styling for webtools

[v]

Our webtools package currently uses absolutely positioned divs which only worked with roundcube-0.4.2, because it was written with the old Rutgers theme in mind.

We should reorganize the HTML structure of webtools so that it doesn't try to absolutely position stuff.

We should also make sure that the plugin works decently well in all themes, ensuring that it works well in the new rutgers theme (based off of larry).

[katiepru]

looks good in larry. waiting for rutgers themes changes just to make sure nothing goes wrong.

[jmatth]

Looks good in the new rutgers theme too.