adjust more UI on the Advanced section, and make other small code & UI tweaks

src/views/SeedBackupView.vue

@@ -2,6 +2,16 @@
   <QuickNav selected="Profile"></QuickNav>
   <!-- CONTENT -->
   <section id="Content" class="p-6 pb-24 max-w-3xl mx-auto">
+    <!-- Back -->
+    <div class="text-lg text-center font-light relative px-7">
+      <h1
+        class="text-lg text-center px-2 py-1 absolute -left-2 -top-1"
+        @click="$router.back()"
+      >
+        <fa icon="chevron-left" class="fa-fw"></fa>
+      </h1>
+    </div>
+
     <!-- Heading -->
     <h1 id="ViewHeading" class="text-4xl text-center font-light pt-4 mb-8">
       Seed Backup