enhance (& fix for mobile) styling and verbiage

src/views/ContactQRScanShowView.vue

@@ -41,6 +41,9 @@
         :dotsOptions="{ type: 'square' }"
         class="flex justify-center"
       />
+      <span class="flex justify-center">
+        Click QR to copy your contact URL to your clipboard.
+      </span>
     </div>
     <div class="text-center" v-else>
       You have no identitifiers yet, so
@@ -55,7 +58,7 @@
     </div>
 
     <div class="text-center">
-      <h1 class="text-4xl text-center font-light pt-4">Scan Contact Info</h1>
+      <h1 class="text-4xl text-center font-light pt-6">Scan Contact Info</h1>
       <qrcode-stream @detect="onScanDetect" @error="onScanError" />
       <span>
         If you do not see a scanning camera window here, check your camera