hint on other projects and their licenses #28

also emphasize free software as a term
and maybe adding a list of attributed projects

templates/about.hamlet

@@ -4,9 +4,16 @@ $newline always
   <h1>About this Eidolon
   <p> Build version: #{version}
   <p>
-    This software is licenced under the
+    This <a href="https://www.gnu.org/philosophy/free-sw.html" target="_blank">
+      free software
+    is licenced under the
     <a href="http://www.gnu.org/licenses/agpl-3.0">
       GNU Affero General Public License 3.0
+  <p>
+    Other free software <!--
+      <a href="@{attribution}"> -->
+    projects included
+    provide their own respective licenses
   <p>
     The source code for this instance can be found at
     <a href="#{appAfferoLink $ appSettings master}" target=_blank>