Add more commands and sources for documentation search

[goestav]

We could use devdocs as source for other docs.

For NodeJS we could use this index (Node v18 LTS) to search for terms.

Example code snippet to map the URLs to the NodeJS docs

const version = 18
const devDocsUrl = new URL("https://devdocs.io/node~18_lts/errors#err_socket_dgram_is_connected")

const filename = devDocsUrl.pathname.split('/').at(-1)
const { hash } = devDocsUrl

const nodeJsUrl = `https://nodejs.org/docs/latest-v${version}.x/api/${filename}.html${hash}`
//    ^ "https://nodejs.org/docs/latest-v18.x/api/errors.html#err_socket_dgram_is_connected"