Credentials for Github Apps cannot be used to download examples sketch for p5 user in local development

[vulongphan]

Nature of issue?

• Found a bug

Details about the bug:

• Operating System: MacOSX
• Steps to reproduce this bug:
  Create a Github Apps using your Github Account
  Fill in the .env file using your Credentials for Github Apps
  Then execute npm run fetch-examples to download the examples for a user p5
  There will be an error saying 401 - Bad Credentials

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[vulongphan]

Hi @catarak, this is an additional issue I discussed with you in #1595 regarding the credentials issue with a Github App. In my PR I updated the installation guide so that other people will not run into the same issue as me.

[vulongphan]

Also @catarak you can tell me if there is any problem with the document update.

[catarak]

Thanks for updating the documentation! I'll leave suggestions directly on your PR.