Add some comments and get eric started (#23666)

Co-authored-by: Eric <eashaw@sailsjs.com>

website/assets/js/pages/customers/new-license.page.js

@@ -40,7 +40,7 @@ parasails.registerPage('new-license', {
   //  ╩═╝╩╚  ╚═╝╚═╝ ╩ ╚═╝╩═╝╚═╝
   beforeMount: function() {
     if(window.location.hash) {
-      if(typeof analytics !== 'undefined') {
+      if(window.analytics !== undefined) {
         if(window.location.hash === '#signup') {
           analytics.identify(this.me.id, {
             email: this.me.emailAddress,

website/assets/js/pages/device-management.page.js

@@ -31,13 +31,13 @@ parasails.registerPage('device-management-page', {
       this.modal = undefined;
     },
     clickSwagRequestCTA: function () {
-      if(typeof gtag !== 'undefined') {
+      if(window.gtag !== undefined){
         gtag('event','fleet_website__swag_request');
       }
-      if(typeof window.lintrk !== 'undefined') {
+      if(window.lintrk !== undefined) {
         window.lintrk('track', { conversion_id: 18587105 });// eslint-disable-line camelcase
       }
-      if(typeof analytics !== 'undefined'){
+      if(window.analytics !== undefined) {
         analytics.track('fleet_website__swag_request');
       }
       this.goto('https://kqphpqst851.typeform.com/to/ZfA3sOu0#from_page=device-managment');

website/assets/js/pages/docs/basic-documentation.page.js

@@ -221,13 +221,13 @@ parasails.registerPage('basic-documentation', {
   methods: {
 
     clickSwagRequestCTA: function () {
-      if(typeof gtag !== 'undefined') {
+      if(window.gtag !== undefined){
         gtag('event','fleet_website__swag_request');
       }
-      if(typeof window.lintrk !== 'undefined') {
+      if(window.lintrk !== undefined) {
         window.lintrk('track', { conversion_id: 18587105 });// eslint-disable-line camelcase
       }
-      if(typeof analytics !== 'undefined'){
+      if(window.analytics !== undefined) {
         analytics.track('fleet_website__swag_request');
       }
       this.goto('https://kqphpqst851.typeform.com/to/ZfA3sOu0#from_page=docs');

website/assets/js/pages/entrance/signup.page.js

@@ -64,19 +64,22 @@ parasails.registerPage('signup', {
       }
     },
 
-    submittedSignUpForm: async function() {
-      // redirect to the /start page.
-      // > (Note that we re-enable the syncing state here.  This is on purpose--
-      // > to make sure the spinner stays there until the page navigation finishes.)
-      //
-      // Naming convention:  (like sails config)
-      // "Website - Sign up" becomes "fleet_website__sign_up"  (double-underscore representing hierarchy)
-      if(typeof gtag !== 'undefined'){
-        gtag('event','fleet_website__sign_up');
+    submittedSignUpForm: async function() {// When the server says everything worked…
+      // Track a "key event" in Google Analytics. (?  but don't we do that when we call analytics.track() [segment] later on in start.page.js?  TODO: eric help please – I suspect this one is either duplicate OR it's actually writing to Google Ads, and not to Google Analytics.  I'm pretty sure segment's .track() is what writes to google analytics.)
+      // > Naming convention:  (like sails config)
+      // > "Website - Sign up" becomes "fleet_website__sign_up"  (double-underscore representing hierarchy)
+      if(window.gtag !== undefined){
+        window.gtag('event','fleet_website__sign_up');
       }
-      if(typeof window.lintrk !== 'undefined') {
+
+      // Track a "conversion" in LinkedIn Campaign Manager.
+      if(window.lintrk !== undefined) {
         window.lintrk('track', { conversion_id: 18587097 });// eslint-disable-line camelcase
       }
+
+      // Redirect to the /start page.
+      // > (Note that we re-enable the syncing state here.  This is on purpose--
+      // > to make sure the spinner stays there until the page navigation finishes.)
       this.syncing = true;
       this.goto(this.pageToRedirectToAfterRegistration);// « / start if the user came here from the start now button, or customers/new-license if the user came here from the "Get your license" link.
     }

website/assets/js/pages/start.page.js

@@ -97,7 +97,7 @@ parasails.registerPage('start', {
       this.psychologicalStage = this.me.psychologicalStage;
     }
     if(window.location.hash) {
-      if(typeof analytics !== 'undefined') {
+      if(window.analytics !== undefined) {
         if(window.location.hash === '#signup') {
           analytics.identify(this.me.id, {
             email: this.me.emailAddress,