feat: add signup link to login and create signup dummy page

packages/web/src/components/LoginForm/style.ee.ts

@@ -0,0 +1,7 @@
+import { styled } from '@mui/material/styles';
+import { Link as RouterLink } from 'react-router-dom';
+
+export const Link = styled(RouterLink)(({theme}) => ({
+  textDecoration: 'underline',
+  marginLeft: theme.spacing(0.5)
+}));