Simplify error message

demos/hello-aframe/demo.js

 {
     if(!Martins.isSupported()) {
         throw new Error(
-            'Use a browser/device compatible with WebGL2 and WebAssembly. ' +
-            'Your user agent is ' + navigator.userAgent
+            'This device is not compatible with AR.\n\n' +
+            'User agent: ' + navigator.userAgent
         );
     }
 

demos/hello-three/demo.js

     {
         if(!Martins.isSupported()) {
             throw new Error(
-                'Use a browser/device compatible with WebGL2 and WebAssembly. ' +
-                'Your user agent is ' + navigator.userAgent
+                'This device is not compatible with AR.\n\n' +
+                'User agent: ' + navigator.userAgent
             );
         }
 

demos/hello-webgl/demo.js

     {
         if(!Martins.isSupported()) {
             throw new Error(
-                'Use a browser/device compatible with WebGL2 and WebAssembly. ' +
-                'Your user agent is ' + navigator.userAgent
+                'This device is not compatible with AR.\n\n' +
+                'User agent: ' + navigator.userAgent
             );
         }
 

demos/hello-world/demo.js

     {
         if(!Martins.isSupported()) {
             throw new Error(
-                'Use a browser/device compatible with WebGL2 and WebAssembly. ' +
-                'Your user agent is ' + navigator.userAgent
+                'This device is not compatible with AR.\n\n' +
+                'User agent: ' + navigator.userAgent
             );
         }
 

demos/touch-three/demo.js

     {
         if(!Martins.isSupported()) {
             throw new Error(
-                'Use a browser/device compatible with WebGL2 and WebAssembly. ' +
-                'Your user agent is ' + navigator.userAgent
+                'This device is not compatible with AR.\n\n' +
+                'User agent: ' + navigator.userAgent
             );
         }
 

docs/getting-started/activate-your-webcam.md

 {
     if(!Martins.isSupported()) {
         throw new Error(
-            'Use a browser/device compatible with WebGL2 and WebAssembly. ' +
-            'Your user agent is ' + navigator.userAgent
+            'This device is not compatible with AR.\n\n' +
+            'User agent: ' + navigator.userAgent
         );
     }
 
 {
     if(!Martins.isSupported()) {
         throw new Error(
-            'Use a browser/device compatible with WebGL2 and WebAssembly. ' +
-            'Your user agent is ' + navigator.userAgent
+            'This device is not compatible with AR.\n\n' +
+            'User agent: ' + navigator.userAgent
         );
     }
 
 {
     if(!Martins.isSupported()) {
         throw new Error(
-            'Use a browser/device compatible with WebGL2 and WebAssembly. ' +
-            'Your user agent is ' + navigator.userAgent
+            'This device is not compatible with AR.\n\n' +
+            'User agent: ' + navigator.userAgent
         );
     }
 
 {
     if(!Martins.isSupported()) {
         throw new Error(
-            'Use a browser/device compatible with WebGL2 and WebAssembly. ' +
-            'Your user agent is ' + navigator.userAgent
+            'This device is not compatible with AR.\n\n' +
+            'User agent: ' + navigator.userAgent
         );
     }
 

docs/getting-started/next-steps.md

 {
     if(!Martins.isSupported()) {
         throw new Error(
-            'Use a browser/device compatible with WebGL2 and WebAssembly. ' +
-            'Your user agent is ' + navigator.userAgent
+            'This device is not compatible with AR.\n\n' +
+            'User agent: ' + navigator.userAgent
         );
     }
 

docs/getting-started/set-up-the-session.md

     try {
         if(!Martins.isSupported()) {
             throw new Error(
-                'Use a browser/device compatible with WebGL2 and WebAssembly. ' +
-                'Your user agent is ' + navigator.userAgent
+                'This device is not compatible with AR.\n\n' +
+                'User agent: ' + navigator.userAgent
             );
         }
 
     try {
         if(!Martins.isSupported()) {
             throw new Error(
-                'Use a browser/device compatible with WebGL2 and WebAssembly. ' +
-                'Your user agent is ' + navigator.userAgent
+                'This device is not compatible with AR.\n\n' +
+                'User agent: ' + navigator.userAgent
             );
         }
 
     try {
         if(!Martins.isSupported()) {
             throw new Error(
-                'Use a browser/device compatible with WebGL2 and WebAssembly. ' +
-                'Your user agent is ' + navigator.userAgent
+                'This device is not compatible with AR.\n\n' +
+                'User agent: ' + navigator.userAgent
             );
         }
 
 {
     if(!Martins.isSupported()) {
         throw new Error(
-            'Use a browser/device compatible with WebGL2 and WebAssembly. ' +
-            'Your user agent is ' + navigator.userAgent
+            'This device is not compatible with AR.\n\n' +
+            'User agent: ' + navigator.userAgent
         );
     }
 

docs/getting-started/set-up-the-tracker.md

     try {
         if(!Martins.isSupported()) {
             throw new Error(
-                'Use a browser/device compatible with WebGL2 and WebAssembly. ' +
-                'Your user agent is ' + navigator.userAgent
+                'This device is not compatible with AR.\n\n' +
+                'User agent: ' + navigator.userAgent
             );
         }
 
     try {
         if(!Martins.isSupported()) {
             throw new Error(
-                'Use a browser/device compatible with WebGL2 and WebAssembly. ' +
-                'Your user agent is ' + navigator.userAgent
+                'This device is not compatible with AR.\n\n' +
+                'User agent: ' + navigator.userAgent
             );
         }