✨(react) add button with icon only

Previously using Button with only an icon made it render with an
internal offset, that wasn't really nice-looking. Now we force the
button to be squared.

packages/react/src/components/Button/index.stories.tsx

@@ -84,3 +84,24 @@ IconRight.args = {
   ),
   color: "primary",
 };
+
+export const IconOnly = Template.bind({});
+IconOnly.args = {
+  icon: (
+    <svg
+      width="24"
+      height="24"
+      viewBox="0 0 24 24"
+      fill="none"
+      xmlns="http://www.w3.org/2000/svg"
+    >
+      <path
+        fill="currentColor"
+        fillRule="evenodd"
+        clipRule="evenodd"
+        d="M17.8724 10.0166H13.248L16.6251 4.07749C16.9258 3.54846 16.2447 3.01176 15.8005 3.42755L6.57343 12.0655C6.22192 12.3946 6.45489 12.9838 6.93615 12.9838H11.5606L8.18353 18.9229C7.88275 19.4519 8.56335 19.9886 9.00746 19.5728L18.2352 10.9349C18.5867 10.6058 18.3537 10.0166 17.8724 10.0166Z"
+      />
+    </svg>
+  ),
+  color: "primary",
+};