Website documentation needs search functionality

Currently as of 07-26-2023, there is no ability to search the [Containers.dev](https://containers.dev/) website for specific reference information.

This would be a well used feature that would help better adoption of the devcontainer spec.

Seems like this is possible via Algolia.

https://dev.to/adrienjoly/make-your-static-site-searchable-with-jekyll-algolia-edh