feat(web.dev): init - Githubissues

🎉 Theme for web.dev 🎉

[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:
- catppuccin.user.css - all the CSS for the userstyle, based on the template.
- preview.webp - composite image of all four individual flavor screenshots stitched together, generated via Catwalk.