fit-text helper now triggers lazyily when slide enters view distance

css/layout.scss

@@ -16,6 +16,12 @@
 	box-sizing: border-box;
 }
 
+// Text that auto-fits it's container
+.reveal .r-fit-text {
+	display: inline-block; // https://github.com/rikschennink/fitty#performance
+	white-space: nowrap;
+}
+
 // Stack multiple elements on top of each other
 .reveal .r-stack {
 	display: grid;