Bug 987202 - Fix form URL on http://www.mozilla.org/gigabit/apply/

Change link to the form("click here")
from: https://docs.google.com/forms/d/1HFas7B6sD3oLxE5FAAYDX1pLoxgBf5mHnj4a1oEay00/edit#
to: https://docs.google.com/forms/d/1HFas7B6sD3oLxE5FAAYDX1pLoxgBf5mHnj4a1oEay00/viewform
Merge pull request #1826 from mmmavis/bug-987202-fix-gigabit-form-url

Bug 987202 - Fix form URL on http://www.mozilla.org/gigabit/apply/
Update rna submodule to fix bug 987328
Merge pull request #1827 from jgmize/improve-note-sort

Update rna submodule to fix bug 987328
bug 973967 - Refresh Get Involved page

This removes the 15th Anniversary slideshow.