Add decap CMS

[prateek3255]

Create the base for adding Decap CMS

Things to keep in mind for testing and next steps:

1. The callback URL has been set for https://scriptified-technetium-co.vercel.app/, so the CMS won't work locally to test any changes to the schema run vercel to deploy and test it there
2. All the issues would be stored in collection/_issues so read the issues from there everywhere
3. We need to replace all the APIs that are being used to reading the issue from the filesystem instead.

[changeset-bot]

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Latest commit: 6b3269a

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