Add something about independence

wiki/src/donate.html

@@ -25,6 +25,10 @@
   some of you to give to keep on providing such a secure platform for
   everybody.</p>
 
+  <p>Donations from individuals, like you, are our most valuable funding
+  as they make Tails more independent from government and corporate
+  funding.</p>
+
   <p>This year, please consider making a donation to protect and sustain
   Tails.</p>