Add "Learning GraphQL" resources to the docs

[funnelfiasco]

We don't need to write our own docs for this, but it would be helpful to curate some links to GraphQL resources for people like me who would like to use GUAC's GraphQL playground but don't have any GraphQL experience.

Some possible resources suggested by colleagues:

• https://graphql.org/learn/
• https://graphql.org/learn/queries/
• https://graphql.org/community/resources/training-courses/
• https://www.howtographql.com/

[aniketh-varma]

Hey @funnelfiasco, I can pick this issue, do you suggest any particular sections where the resources need to be added on the docs page. I was thinking of adding the resources under the Developing tools on top of GUAC / GraphQL section.

[funnelfiasco]

@aniketh-varma welcome to GUAC! I think a standalone page would be a good starting point and then we can link to it from the existing GraphQL page. My reasoning is that it's already a pretty lengthy page. Having something at/near the top of the page that links to the learning resources (preferably with some description and curation of the links) would be ideal.

However, I'd definitely be open to other ideas, so if you have an approach that you think is better, then go for it!

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