editor3d: font fix

frontend/apps/editor3d/app/index.html

@@ -1,4 +1,4 @@
-<!DOCTYPE html>
+<!doctype html>
 <html lang="en">
   <head>
     <meta charset="utf-8" />
@@ -7,6 +7,12 @@
 
     <meta name="viewport" content="width=device-width, initial-scale=1" />
     <link rel="icon" type="image/x-icon" href="/favicon.ico" />
+    <link rel="preconnect" href="https://fonts.googleapis.com" />
+    <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin />
+    <link
+      href="https://fonts.googleapis.com/css2?family=Source+Sans+3:ital,wght@0,200..900;1,200..900&display=swap"
+      rel="stylesheet"
+    />
     <!-- <link rel="stylesheet" href="/src/styles.css" /> -->
   </head>
   <body className="overflow-hidden bg-ui-background">