Fixed documentation issue #231

Signed-off-by: Vikash Gupta <write2vikash@gmail.com>

Author: vikashg

docs/source/modules/index.md

@@ -1,58 +1,14 @@
 # MODULES APIS
 
-## Core
-
 ```{toctree}
-:maxdepth: 3
-:hidden:
+:glob:
+:maxdepth: 2
 
 core
-```
-
-## Domain objects
-
-```{toctree}
-:maxdepth: 2
-:hidden:
 domain_objects
-```
-
-## Operators
-
-```{toctree}
-:maxdepth: 2
-:hidden:
 operators
-```
-
-## Models
-
-```{toctree}
-:maxdepth: 2
-:hidden:
 models
-```
-
-## Graphs
-
-```{toctree}
-:maxdepth: 2
-:hidden:
 graphs
-```
-
-## Executors
-
-```{toctree}
-:maxdepth: 2
-:hidden:
 executors
-```
-
-## Datastores
-
-```{toctree}
-:maxdepth: 2
-:hidden:
 datastores
 ```