Subject: Remove broken links from documentation
Author: Alexander Sulfrian <alexander@sulfrian.net>
Forwarded: https://github.com/we-like-parsers/pegen/pull/110

This removes three broken links just cluttering the documentation:
* The genindex is currently empty, because no index directives are used.
* The modindes is not generated at all and the link is invalid, because no
  python modules are documented.
* The search page is just empty, because the search is triggered from the input
  field in the sidebar.

Index: python-pegen/docs/index.rst
===================================================================
--- python-pegen.orig/docs/index.rst
+++ python-pegen/docs/index.rst
@@ -67,10 +67,6 @@ Indices and tables
    peg_parsers
    grammar
 
-* :ref:`genindex`
-* :ref:`modindex`
-* :ref:`search`
-
 Developing
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