Rollup merge of #54244 - kzys:search-box, r=GuillaumeGomez
Rollup merge of #54244 - kzys:search-box, r=GuillaumeGomez

Add a small search box to seach Rust's standary library

This change partially addresses #14572. No CSS doesn't look fancy
but at least it is functional.

GBGamer/rust,GBGamer/rust,aidancully/rust,graydon/rust,aidancully/rust,aidancully/rust,graydon/rust,GBGamer/rust,graydon/rust,GBGamer/rust,graydon/rust,aidancully/rust,GBGamer/rust,graydon/rust,aidancully/rust,GBGamer/rust,aidancully/rust,graydon/rust,GBGamer/rust,GBGamer/rust