[docs]: Fix code block dark mode

[leovoon]

Description

Add a dark mode background to the code blocks when the user toggles dark mode or when their preferred color scheme is set to dark. Choose a background color that has the same tone as the suggested color.

Issue Ticket Number

Fixes #53

Type of change

• 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)
• Fix or improve the documentation
• This change requires a documentation update

Checklist

• I have followed the contributing guidelines of this project as mentioned in CONTRIBUTING.md
• I have created an issue ticket for this PR
• I have checked to ensure there aren't other open Pull Requests for the same update/change?
• I have performed a self-review of my own code
• I have run tests locally to ensure they all pass
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes needed to the documentation

I'm participating in Hacktoberfest.

[vercel]

@leovoon is attempting to deploy a commit to the Cloudinary DevX Team on Vercel.

A member of the Team first needs to authorize it.

[vercel]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

Name	Status	Preview	Comments	Updated (UTC)
svelte-cloudinary	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 4, 2023 5:29pm

[matiasfha]

This takes precedence over the user's decision, If the user chooses a light theme but the OS preferred scheme is dark then this media query takes over.

[matiasfha]

Thank you for your work and collaboration. I noticed a minor problem with the media query that was used. If you could address this, we would be able to accept your PR as a complete fix.

[matiasfha]

Good work!
Thanks for your collaboration!

[matiasfha]

@all-contributors
please add @leovoon for code

[allcontributors]

@matiasfha

I've put up a pull request to add @leovoon! 🎉

[colbyfayock]

@leovoon congrats on the merged PR! since it's officially October, you've always qualified for Hacktoberfest swag! please email hacktoberfest@cloudinary.com with your github username and a link to your contribution where I'll follow up to request more information for getting you your swag

https://cloudinary.com/blog/hacktoberfest-celebrate-open-source-sdks

[leovoon]

@leovoon congrats on the merged PR! since it's officially October, you've always qualified for Hacktoberfest swag! please email hacktoberfest@cloudinary.com with your github username and a link to your contribution where I'll follow up to request more information for getting you your swag

https://cloudinary.com/blog/hacktoberfest-celebrate-open-source-sdks

Thanks!

[github-actions]

🎉 This PR is included in version 1.1.1 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀