Added a new Sweet Dracula theme

[juanra]

Pull Request Template

Discord username (optional)

Juanra#6005

Name of theme

Sweet Dracula. This theme is based in PROxZIMA/sweet-dracula VS Code Theme (https://github.com/PROxZIMA/sweet-dracula). All credits to PROxZIMA.

How Has This Been Tested?

Have you run the python script? python3 ./scripts/gen_theme_previews.py <folder-name-eg-standard> Yes. I also use it for a year.

Notes

This theme does not use a background image.