Add search engine in API page

[JesusValeraDev]

📚 Description

The idea is to be able to find symbols in API, right now it's a mess.

⚠️ Dependencies

In order to be able to work on this feature, the #5 should be merged.

[Chemaclass]

I think we need to start thinking about redesign the website because we want to add another section for tutorials and learning purposes, not simply docu 🤔

And yes, this searching functionality is something really interesting that we need to start thinking about. This is the official docu from Zola: https://www.getzola.org/documentation/content/search/

[JesusValeraDev]

We need to implement the search in the mobile version, but I think we can close this issue for now.