Remove SSL Example & postgresql.conf from Custom Config

This commit removes the 'primary-replica-ssl' example, which is not needed
now that SSL support has been added directly to the Operator.  Also, removed
the postgresql.conf file from the 'custom-config' example since a custom
postgresql.conf is no longer supported.

Author: andrewlecuyer

examples/custom-config/postgres-ha.yaml

@@ -9,6 +9,9 @@ bootstrap:
         log_statement: none
         max_wal_senders: 6
         shared_preload_libraries: pgaudit.so
+        shared_buffers: 256MB
+        temp_buffers: 10MB
+        work_mem: 5MB
 postgresql:  
   pg_hba:
     - local all postgres peer