feat(desmos): init

[gradylink]

🎉 Theme for Desmos 🎉

Desmos is an online calculator suite most known for their graphing calculator and is used in many schools.

💬 Additional Comments 💬

The graph is not themed intentionally to make sure that artwork is seen as it is intended and also, I don't have access to any of the teacher or student dashboards, so those are currently not themed.

🗒 Checklist 🗒

• [x] I have read and followed Catppuccin's submission guidelines.
• [x] I have made a new directory underneath /styles/<name-of-website> containing the contents of the /template directory.
  • [x] I have ensured that the new directory is in lower-kebab-case.
  • [x] I have followed the template and kept the preprocessor as LESS.
• [x] I have made sure to update the userstyles.yml file with information about the new userstyle.
• [x] I have included the following files:
  • [x] catppuccin.user.less - all the CSS for the userstyle, based on the template.