add words under feed, add big "plus" on first page, and reword some things

src/components/OnboardingDialog.vue

@@ -19,14 +19,17 @@
         <span v-if="numContacts > 0">
           click on {{ firstContactName }}'s name or
         </span>
-        click on "Unnamed" to express your appreciation for... whatever -- like
+        click on the <span class="bg-green-600 text-white rounded-full">
+          <fa icon="plus" class="fa-fw"></fa>
+        </span>
+        button to express your appreciation for... whatever -- like
         thanks for showing you all these fascinating stories of
         <em>gratitude</em>.
       </p>
       <p v-else class="mt-4">
-        The feed underneath this pop-up shows the latest gifts recognized by
-        others. Once someone registers you, you'll be able to log your
-        appreciation, too.
+        The feed underneath this pop-up shows the latest gifts that others have
+        recognized. Once someone registers you, you can log your appreciation,
+        too.
       </p>
 
       <p class="mt-4">
@@ -97,7 +100,7 @@
       <p class="mt-4">
         When you find some that seem interesting, you can offer your help. You
         are welcome to make your offer conditional, for example if they get 2
-        other people, too.
+        other people to help besides you.
       </p>
 
       <p class="mt-4 flex items-center">