updated the index page: 1) removed sample list: it duplicated (and was out-of-date...

updated the index page: 1) removed sample list: it duplicated (and was out-of-date) the doxygen samples page; 2) removed tex2rtf and odbc references; 3) merged with html/index.htm so that the entire 'html' folder can be removed; temporarily commented-out the FAQ (need to decide how to handle them) and the platforms/i18n pages (need to decide how to handle them)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@52915 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775