chore(docs): Updated with Windows Configuration

[JoseSoteloCohen]

Added SET GATSBY_GRAPHQL_IDE=playground&gatsby develop as the configuration needed to make it work in Windows.

Description

Added SET GATSBY_GRAPHQL_IDE=playground&gatsby develop as the configuration needed to make it work in Windows.

After reading the docs I was unable to find a solution to why it wasn't working on my local environment until I finally found the solution on a Spectrum post, so I think that this information should be in the docs to make it easy for newcomers like myself.

Documentation

Gatsby Graphql Playground docs

[vladar]

We mention cross-env in one of our articles. I'd recommend using it instead of SET variable

[JoseSoteloCohen]

We mention cross-env in one of our articles. I'd recommend using it instead of SET variable

Updated it! plus added a way to install cross-env

[laurieontech]

@JoseSoteloCohen would love to get this merged! Could you address Vlad's most recent comment and we can get this in?

[JoseSoteloCohen]

@laurieontech Vladar is right, it wasn't needed so I accepted the suggestion :)

[laurieontech]

Awesome! Let's get this in.

[gatsbot]

Holy buckets, @JoseSoteloCohen — we just merged your PR to Gatsby! 💪💜

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