Remove rst_prolog, things are stable at this point

Author: tony

doc/conf.py

@@ -63,16 +63,6 @@
 project = about['__title__']
 copyright = about['__copyright__']
 
-rst_prolog = """
-.. note::
-
-    tmuxp is usable but still needs your help reporting errors, bugs and
-    usability feedback. If you encounter an error, please post on the
-    `Issue tracker`_.
-
-.. _Issue tracker: https://github.com/tony/tmuxp/issues
-"""
-
 # The version info for the project you're documenting, acts as replacement for
 # |version| and |release|, also used in various other places throughout the
 # built documents.