fix #224 - floating admin-only logo and admin.css getting included in non-admin pages
- fix is: all admin (non-public) pages inherit from base-admin.html which defines additional theming and inherits base.html
- public stuff now inherits base.html only which doesn't define those elements
fix #224 - part 2 - renaming stuff
- per Eli code review suggestion, renaming sections to be more generic
Merge pull request #241 from EliAndrewC/bug_admin_css_wrongly_included

fix #224 - floating admin-only logo + admin.css getting included in non-admin pages