Cannot search for syntax

[MeAmAnUsername]

Summary
Searching for syntax on spoofax.dev does not work

To reproduce
Given: I am on www.spoofax.dev and I search for some syntax, e.g. := or ":="
Expected: It shows a result for the Stratego assignment operator
Actual: It says "No matching documents"

Description
Searching for syntax is an important part of using a language you are unfamiliar with (e.g. new students, new users). The way it works now, you have to kind of know what page the syntax could be explained on and search for it within the browser with CTRL+F.