docs: allow $schema key in config.schema.json

[dbtek]

Fixes json schema validation to allow $schema key which provides ide support.

Related issue(s)

#1082

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• I have referenced an issue containing the design document if my change
  introduces a new feature.
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[zepatrik]

Awesome 👍
The only problem is that this file is auto-generated from https://github.com/ory/keto/blob/642f674f99da3315d6c8b310f71b7a6999af785f/embedx/config.schema.json so you have to add it there as well to make this change persistent.

[zepatrik]

I quickly transferred the changes there.

[dbtek]

Thanks @zepatrik. Sorry I couldn't reply in time.

[vinckr]

Hello @dbtek
Congrats on merging your first PR in Ory 🎉 !
Your contribution will soon be helping secure millions of identities around the globe 🌏.
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