Switch handlebars packages

The express3-handlebars package got renamed to “express-handlebars” so
I went ahead and switched out the packages. No other changes are
required. Regressions tests currently show no difference in behavior.
Connect "remove skill" button click to DB

The “remove skill” button now updates the work history document and
removes the skill the user clicked on from that work history after it
fades out. Before this, it only removed the skill label from the DOM.