Move list edit/namespace to separate pages and in a menu (#397)

Co-authored-by: kolaente <k@knt.li>
Reviewed-on: https://kolaente.dev/vikunja/frontend/pulls/397
Co-authored-by: konrad <konrad@kola-entertainments.de>
Co-committed-by: konrad <konrad@kola-entertainments.de>

src/components/misc/nothing.vue

@@ -0,0 +1,11 @@
+<template>
+	<p class="has-text-centered has-text-grey is-italic p-4 mb-4">
+		<slot></slot>
+	</p>
+</template>
+
+<script>
+export default {
+	name: 'nothing'
+}
+</script>