✨(react) implement Button with official tokens

Now that we have all the official design tokens we can use them
to build the button component in various colors matching the
design system's ones.

packages/react/src/components/Button/tokens.ts

@@ -2,7 +2,9 @@ import { DefaultTokens } from "@openfun/cunningham-tokens";
 
 export const tokens = (defaults: DefaultTokens) => {
   return {
-    "border-radius": "5px",
-    shadow: "0px 0px 10px 1px " + defaults.theme.colors.primary + ";",
+    "border-radius": "2px",
+    height: "48px",
+    "font-size": defaults.theme.typo.l,
+    "font-weight": defaults.theme.typo.medium,
   };
 };