Subgraph examples

[akshay-ap]

Fixes #797

Add Ocean subgraph examples

Changes proposed in this PR:

• List data NFTs
• List all tokens
• Get data NFT information
• Get datatoken information
• Get Fixed Rate Exchanges

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[jamiehewitt15]

This is good. As well as showing how to run the query with a python script, can you also explain that the queries can as be done in the graphiQL interface. Also, another possible extension would be to also have a tab showing the JS version of the python script but that's not essential

[akshay-ap]

This is good. As well as showing how to run the query with a python script, can you also explain that the queries can as be done in the graphiQL interface. Also, another possible extension would be to also have a tab showing the JS version of the python script but that's not essential

added GraphQL UI hint in each page.

Can we add JS version later?

[jamiehewitt15]

added GraphQL UI hint in each page.

This is good thanks

Can we add JS version later?

Yeah that's reasonably low priority / nice-to-have. I create an issue to ensure we don't lose track of it.

Something else that I've noticed here is that the opening page on the sub-graph is too short. We should put a bit more info in here which can largely be copied from the readme, how to run it locally etc...

[jamiehewitt15]

The examples are really good. Any other improvements, as mentioned above can be handled in another PR