More tooltips in the Notebook menu

I've had this on my TODO list for a while, but I think having more of these
little tooltips will help new users.

I've removed how we previously attached title attributes using JQuery, and have
placed the title attributes directly in the template source.

I looked into whether or not this is possible using just CSS, and this does not
seem to be the case, and I think it makes more sense to have these title
attributes live directly in the templates, rather than in the javascript.