Make builds of the editor and the website serve their own local fonts (#2186)

* WIP

* Done?

* Install fonts in CI

* Use absolute path so minified inlined CSS works

* Fix Bezier-rs demo fonts?

* Use opsz

* Revert removal of text balancer

* Pull in the text balancer from our static host

website/sass/component/code-snippet.scss

@@ -38,7 +38,7 @@ pre {
 			content: attr(data-lang);
 			color: rgba(var(--color-seaside-rgb), 0.5);
 			text-transform: lowercase;
-			font-family: "Inter", sans-serif;
+			font-family: "Inter Variable", sans-serif;
 			font-size: 0.75em;
 			font-weight: 700;
 			font-style: italic;

website/sass/component/feature-box.scss

@@ -46,7 +46,7 @@
 h1.feature-box-header.feature-box-header {
 	&,
 	& a {
-		font-family: "Inter", sans-serif;
+		font-family: "Inter Variable", sans-serif;
 		line-height: 1.5;
 		font-weight: 800;
 		text-transform: uppercase;