LP1948035 Angular 12 updates

LP1948035 Angular 12 updates

Run ng upgrade from 10 -> 11 -> 12.

Updates package.json deps for Angular 12.

Removes deprecated angular/http dependency

Fix a couple of cases where Promise<any> now requires resolve(something)
instead of resolve() (which would be Promise<void>).

Fix some CSS syntax issues.

Signed-off-by: Bill Erickson <berickxx@gmail.com>
Signed-off-by: Jane Sandberg <sandbergja@gmail.com>