Add dracula theme

[jonas-w]

Description

The mission of the dracula theme is to be available everywhere.
I created this for my own instance, as cinny was the only application in my setup not having dracula.

I used the official HSL colors from here.

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)
• This change requires a documentation update

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings

[github-actions]

CLA Assistant Lite bot All contributors have signed the CLA ✍️ ✅

[jonas-w]

I have read the CLA Document and I hereby sign the CLA

[github-actions]

Preview: https://1198--pr-cinny.netlify.app
⚠️ Exercise caution. Use test accounts. ⚠️

[ajbura]

Closing as not plained