fix(webapp): rectify sign-up form text

webapp/src/views/SignUp.vue

@@ -62,7 +62,7 @@
               >
                 <v-radio label="Configure your own domain (Managed DNS)." value="custom" tabindex="2"></v-radio>
                 <v-radio :label="`Register a new domain under ${LOCAL_PUBLIC_SUFFIXES[0]} (dynDNS).`" value="dynDNS" tabindex="2"></v-radio>
-                <v-radio label="No, I'll add one later through the API." value="none" tabindex="2"></v-radio>
+                <v-radio label="No, I'll add one later." value="none" tabindex="2"></v-radio>
               </v-radio-group>
 
               <v-text-field