graphql reference documentation page

[Yaminyam]

Motivation  

[Why is this Task important? Explain the context and reasons for this task.]  

• Our project is open-sourced and it should be easy for users to understand how to use it without looking at the code.

Objective  

[Clearly state the purpose or goal of this task.]  

• https://docs.backend.ai/en/latest/manager/rest-reference/index.html
  Currently, the REST API provides API reference documentation in the form above.
  Let's make graphql provide the same reference documentation.

Details  

[Outline the specific steps or changes needed to complete this task.]  

1. Select the appropriate static documentation delivery tool for graphql.
2. Add an index.rst that adds a graphql-reference page to your docs.

Impact  

[Describe how this task may indirectly influence other services, if at all.]