[Github Gists] OAuth 2.0 support

[jfkisafk]

Description

• Uses Raycast OAuth2.0 GitHub integration with repo read:user gist scopes.
• ⚠️Disables the personal access token preference. Users can delete their tokens after successful OAuth2.0 connection.
• Minor refactoring and updated dependencies.

Screencast

Checklist

• [x] I read the extension guidelines
• [x] I read the documentation about publishing
• [x] I ran npm run build and tested this distribution build in Raycast
• [x] I checked that files in the assets folder are used by the extension itself
• [x] I checked that assets used by the README are placed outside of the metadata folder

• closes https://github.com/raycast/extensions/issues/13402

[raycastbot]

Thank you for your contribution! :tada:

🔔 @koinzhang @Aayush9029 @LunaticMuch @pernielsentikaer @nbbaier you might want to have a look.

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[koinzhang]

Hi @jfkisafk Good job!

[jfkisafk]

Hello @koinzhang thanks! I forgot to make this PR open for review, now I have and you can review when you get time 🙌

[koinzhang]

It's ok👍

[github-actions[bot]]

Published to the Raycast Store: https://raycast.com/koinzhang/github-gist

[raycastbot]

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