[docs] Use normal font-feature-settings for AskAI bot (#20692)

## Summary & Motivation

This should hopefully fix the ugly font issue for people without Open Sans.

Before
<img width="389" alt="image"
src="https://github.com/dagster-io/dagster/assets/1045990/c99d304c-a84a-42b8-b1d2-cd252a9ebd74">


After
<img width="335" alt="image"
src="https://github.com/dagster-io/dagster/assets/1045990/dc49ed64-9c19-40e3-8ccb-755066ed2865">

docs/next/pages/_document.js

@@ -31,7 +31,7 @@ export default class MyDocument extends Document {
               />
             </>
           )}
-          <co-pilot copilot_id="dagster">
+          <co-pilot copilot_id="dagster" style={{fontFeatureSettings: 'normal'}}>
             <div
               slot="fab"
               className="bg-lavender text-gray-700 px-24 py-2 rounded-full flex flex-row items-center"