Improve quickref system's long description.

quickref.asd

@@ -25,9 +25,15 @@
   :description "Reference Manuals for Quicklisp Libraries"
   :long-description "\
 Quickref is a global documentation project for Common Lisp libraries.
-Quickref uses Declt to automatically generate reference manuals for all
-libraries available in Quicklisp. Reference manuals are generated in HTML
-and made available online at http://quickref.common-lisp.net."
+It generates a website containing reference manuals for every Quicklisp[1]
+library available. The reference manuals are generated by Declt[2] in
+Texinfo[3] format, and then processed by makeinfo. The official Quickref
+website[4] is kept up-to-date with Quicklisp.
+
+[1] https://www.quicklisp.org
+[2] https://github.com/didierverna/declt
+[3] https://www.gnu.org/software/texinfo/
+[4] http://quickref.common-lisp.net"
   :author "Antoine Martin"
   :license "BSD"
   :depends-on (:quickref.core))