change document theme, add reset_pass utiltiy

docs/cinder/main.html

@@ -0,0 +1,10 @@
+{% extends "base.html" %}
+
+{#
+The entry point for the MkDocs Theme.
+
+Any theme customisations should override this file to redefine blocks defined in
+the various templates. The custom theme should only need to define a main.html
+which `{% extends "base.html" %}` and defines various blocks which will replace
+the blocks defined in base.html and its included child templates.
+#}