Move documentation-related content from the README to the website

[alcidesqueiroz]

As we're preparing to launch Optic's website, let's move all documentation-related content from the README to the new website.

[github-actions]

🎉 This issue has been resolved in version 4.7.7 🎉

The release is available on:

• GitHub release

Your optic bot 📦🚀