added announcement-details url and html file, created absolute url function for each announcement post, and created announcement list and detail view classes

implemented assignment-edit.html features + fixed some buttons for assignment-detail.html and assignment-add.html

added to a total of 10 record for widget user and department models, minor edits on widget user edit page to fit specs

created widgetuser-details.html; edited views.py: fixed WidgetUserDetailView; edited dashboard.html: stylistic edits

edited dashboard.html: added links, changed title, and added add button as indicated in specs; misc stylistic changes too