add 'isRegistered' check to guard against many buttons

src/views/ProjectsView.vue

@@ -189,10 +189,14 @@
     <InfiniteScroll v-if="showProjects" @reached-bottom="loadMoreProjectData">
       <div v-if="projects.length === 0" class="text-center py-4">
         You have not announced any projects.
-        <br />
-        Hit the big
-        <fa icon="plus" class="bg-blue-600 text-white px-1 py-1 rounded-full" />
-        button. You'll never know until you try.
+        <div v-if="isRegistered">
+          Hit the big
+          <fa
+            icon="plus"
+            class="bg-blue-600 text-white px-1 py-1 rounded-full"
+          />
+          button. You'll never know until you try.
+        </div>
       </div>
       <ul id="listProjects" class="border-t border-slate-300">
         <li