Resources Page Fixes

[lmock]

• Also on Resources, don’t list the Piazza groups. Remember kids can read this site.
• And I think “TED Talk” means “TEDx Talk.”
• “Hardware compatible with Snap!” should be “External devices…” or something; at first I thought it meant “Will Snap! run on my Chromebook?”
• AP CSP section in Resources != resource links in AP CSP main page. There should be only one of these lists. The Resource page should have a link to the APCSP page instead.
• The “course materials for download” should say “Obsolete versions of course materials” or (better) just flushed.
• The sample Snap! Projects at the bottom of the Resources page are kind of obsolete. Instead link to the sample projects on s.b.e