SEO optimization of Manifest docs

[SebConejo]

Official project documentation serves as a key entry point for new visitors, making it an ideal target for SEO optimization. As Manifest is a new project, we face challenges in gaining visibility and recognition.

The doc is available here: https://manifest.build/docs/
The docs repo is available here: https://github.com/mnfst/docs

[Sauhard74]

@SebConejo i have prior experience in building various websites and webapps as a core mern stack developer , I wish to contribute to your project and get assigned under both SEO issues