remove .replit

[DaveMadden]

This .replit file breaks a lot of Replit's functionality on import. Our GitHub import tool now adds the proper .replit file, so removing this will make it run better when imported.

Source: I'm a Support Engineer at Replit

Checklist:

• [X] I have read freeCodeCamp's contribution guidelines.
• [X] My pull request has a descriptive title (not a vague title like Update index.md)

Closes #XXXXX