fix: explicitly add .sr-only

The package `fontawesome` previously provided this but refactored their
code to not require this anymore. As we still use it, this is needed.

Author: BGruenberg

src/styles.scss

@@ -511,3 +511,14 @@ a,
 .text-dark-gray {
   color: var(--dark-gray, #{$dark-gray})
 }
+
+.sr-only {
+  position: absolute;
+  width: 1px;
+  height: 1px;
+  padding: 0;
+  margin: -1px;
+  overflow: hidden;
+  clip: rect(0, 0, 0, 0);
+  border: 0;
+}