doc: use native reST anchors.

diff --git a/doc/admire/math.rst b/doc/admire/math.rst
index 4f8d8d2c4eb0700086979987e7c54927991fcd91..4e813db64873462a89f86157f7c518c6d4cd658b 100644 (file)
--- a/doc/admire/math.rst
+++ b/doc/admire/math.rst
@@ -122,9 +122,7 @@ m.css math
 
                 Get the Pelican plugin
 
-.. raw:: html
-
-    <div id="demo"></div>
+.. _demo:
 
 Demo time!
 ==========