feat: remove prettier rule, add related docs

[JounQin]

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Description

Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change.

Fixes #395

Type of change

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• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Screenshots/Sandbox (if appropriate/relevant):

N/A

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• examples/prettier

Test Environment:

• OS: macOS
• @graphql-eslint/eslint-plugin: 0.9.1
• NodeJS: 14.16

Checklist:

• I have followed the CONTRIBUTING doc and the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests and linter rules pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

Further comments

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[changeset-bot]

🦋 Changeset detected

Latest commit: 7d9bb70

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
@graphql-eslint/eslint-plugin	Minor
@graphql-eslint/example-prettier	Patch

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[dotansimha]

This is great, thank you @JounQin !
Can you please just rebase your PR and then we can get this merged?

[JounQin]

@dotansimha Done!

[dimaMachina]

@JounQin i think you definitely must add *.ts/*.graphql to override object for turn off prettier/prettier rule

[JounQin]

@B2o5T Oh, right, I'll add .jsx/.tsx too soon.

[dotansimha]

Thank you @JounQin . I'm merging this one, but might take a few days to release, since I want to bump a major in this one, and I plan to squeeze in a few more change for v1.