It's very tiny. We might replace it in the future but that will do for
now.

jQuery is super easy to write. Some of us are able to write Vanilla JS
equivalent that would make our pages faster to load but let's not block
on this extra work.

This reverts commit d8baf105.

Donating is a linear process so it makes sense to stay in the same tab.
Also, /donate has very little way out (external links) so leaving people
there is not useful either.

Let's keep the full version in the Git checkout for some times, just in
case it might be useful to use in some circumstances (for debugging for
example).

... which have been broken since the upgrade to
1:45.1.0-1~deb8u1+tails2.

Fix-committed: #11571

While preparing Tails 2.6 it was discovered that our last minute bump of
the 'debian' snapshot (to get Jessie 8.6) cause linux-compiler-gcc-* to
be updated to a version for another Linux version than what we install,
resulting in the tagged snapshot being impossible to create since it
would require two different linux source packages (which is not
supported).

This reverts commits:

* ab562fd4
* c0bc655c
* 80d0667a

The last minute attempt to include it in Tails 2.6 was a bad (too hasty)
idea, e.g. USB installations don't boot (pre-init results in
"FAT-fs (sdb1): IO charset ascii not found"). Also it seems that the
backport of Linux 4.7 hasn't gone through the proper Debian QA process.