git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/13.x@52170 b456876b-0849-0410-b77d-98878d47e9d5
[ENH] (Along with r52170) replaces unneeded bootstrap.css and tiki.css import statements in bootswatch_themes.css with CSS content that warns users to select a theme option. Probably only needed when the theme-switch module is used.

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/13.x@52171 b456876b-0849-0410-b77d-98878d47e9d5