make functions a drawer only

(cherry picked from commit 8c4736b)

Author: mongoKart

snooty.toml

@@ -1,19 +1,16 @@
 name = "php-library"
 title = "PHP Library Manual"
 
-intersphinx = [ "https://www.mongodb.com/docs/manual/objects.inv"
-              ]
+intersphinx = ["https://www.mongodb.com/docs/manual/objects.inv"]
 
 toc_landing_pages = [
     "/reference/class/MongoDBClient",
     "/reference/class/MongoDBCollection",
     "/reference/class/MongoDBDatabase",
     "/reference/class/MongoDBGridFSBucket",
-    "/reference/functions",
     "/reference/result-classes",
     "/reference/write-result-classes"
 ]
 
 [substitutions]
 php-library = "MongoDB PHP Library"
-