fix(a11y): WCAG 2.1 AA fixes (#2219)

apps/client/src/components/ui/skip-to-main.tsx

@@ -0,0 +1,13 @@
+import { useTranslation } from "react-i18next";
+import classes from "./skip-to-main.module.css";
+
+export const MAIN_CONTENT_ID = "main-content";
+
+export function SkipToMain() {
+  const { t } = useTranslation();
+  return (
+    <a href={`#${MAIN_CONTENT_ID}`} className={classes.skipLink}>
+      {t("Skip to main content")}
+    </a>
+  );
+}