Use Bootstrap default page widths for admin pages & CSS cleanup

- Remove no-container conditional logic
- Kill a bunch of !importants and just override with the power of specificity
- Remove set_use_container since all the pages now use the container
- Move around some CSS
- Remove unused external site CSS
Add member notes to member admin page

- Add scholarhsip/dues info to member admin page, too
- Maybe someday we won't need the dues page at all!