[master < E-mage-export] Add MAGE export import documentation

[imilinovic]

Description

Add MAGE json, json_graph, cypher_all and cypher docs.

Pull request type

Please delete options that are not relevant and check the ones that are.

• [X] Documentation improvements

Related PRs and issues

PR this doc page is related to: Closes (link to issue): PR348

Checklist:

• [X] I checked all content with Grammarly
• [X] I performed a self-review of my code
• [X] I made corresponding changes to the rest of the documentation
• [X] The build passes locally
• [X] My changes generate no new warnings or errors