Replaced usages of Responsive with @artsy/fresnel

Responsive has been removed in newest versions of semantic-ui-react

src/util/media.ts

@@ -0,0 +1,11 @@
+import {createMedia} from '@artsy/fresnel';
+
+/** Defines the breakpoints at which to show different UI variants. */
+const AppMedia = createMedia({
+  breakpoints: {
+    small: 320,
+    large: 768,
+  },
+});
+export const mediaStyles = AppMedia.createMediaStyle();
+export const {Media, MediaContextProvider} = AppMedia;