Created ssr demo and moved csr to a sub-folder + rebuild

demo/server_side_rendering/pages/index.vue

@@ -0,0 +1,19 @@
+<template>
+  <div>
+    <modal name="foo">bar</modal>
+    <button @click="$modal.show('foo')">
+      Open modal
+    </button>
+    <p>Hi from {{ name }}</p>
+  </div>
+</template>
+
+<script>
+export default {
+  asyncData ({ req }) {
+    return {
+      name: req ? 'server' : 'client'
+    }
+  }
+}
+</script>