remove old page

Author: mongoKart

source/fundamentals.txt

@@ -20,7 +20,6 @@ Fundamentals
    /fundamentals/gridfs
    /fundamentals/indexes
    /fundamentals/in-use-encryption
-   /fundamentals/periodic-executors
    /fundamentals/type-hints
 
 - :ref:`pymongo-auth`
@@ -32,5 +31,4 @@ Fundamentals
 - :ref:`pymongo-gridfs`
 - :ref:`pymongo-indexes`
 - :ref:`pymongo-in-use-encryption`
-- :ref:`pymongo-periodic-executors`
 - :ref:`pymongo-type-hints`