Comment 7 for bug 1895737

I've given this another pass at https://git.evergreen-ils.org/?p=working/Evergreen.git;a=shortlog;h=refs/heads/user/jboyer/lp1895737_bootstrap_curbside2 / working/user/jboyer/lp1895737_bootstrap_curbside2

I've addressed the styling issues by not trying to wedge the tpac version into the boostrap opac as simplistically as I was, so this version also collapses better when used on a mobile device than before. Also I've taken a couple steps to avoid allowing you to choose a date in the past, and there's now a message after clicking the Alert Staff button.