update README.md

[Imtiaz-Zahir]

Updated installation instructions. Fix example error. change example

[sweep-ai[bot]]

Apply Sweep Rules to your PR?

• [ ] Apply: All new business logic should have corresponding unit tests.
• [ ] Apply: Refactor large functions to be more modular.
• [ ] Apply: Add docstrings to all functions and file headers.

[matteobruni]

@tsparticles/slim is not required when using @tsparticles/react, as I said in other similar PRs. There are comments that explains that, and you also removed them in the PR.

[Imtiaz-Zahir]

redame.md Examples have some error. i hope you will change the readme.md.