feat: add externalLink and getDomain utilities

src/util.tsx

@@ -65,7 +65,10 @@ export const shuffle = (list: any[]) => {
   return list;
 };
 
-export const getHost = () => "https://rappli.ch";
+export const getDomain = () =>
+  import.meta.env.SSR ? process.env.DOMAIN || "localhost" : location.hostname;
+
+export const getHost = () => `https://${getDomain()}`;
 
 export const onClickFocus: JSX.EventHandlerUnion<
   HTMLAnchorElement,
@@ -83,3 +86,5 @@ export const onClickFocus: JSX.EventHandlerUnion<
 
   targetEl.focus();
 };
+
+export const externalLink = { target: "_blank", rel: "noopener" };