Fixed VuePress build error

Added a <ClientOnly> component around the code blocks couse they're not SSR compatible.

Author: Sandstedt

docs/tutorials/getting-started.md

@@ -12,54 +12,58 @@
 
 - Create your animations. What about a bouncy circle?
 
-<ExampleCircle>
-```js
-var circle = new mojs.Shape({
-  parent:       '#circle-anim',
-  shape:        'circle',
-  fill:         {'#F64040': '#FC46AD'},
-  radius:       {20: 80},
-  duration:     2000,
-  isYoyo:       true,
-  easing:       'elastic.inout',
-  repeat:       999,
-})
-.play();
-```
-</ExampleCircle>
+<ClientOnly>
+  <ExampleCircle>
+  ```js
+  var circle = new mojs.Shape({
+    parent:       '#circle-anim',
+    shape:        'circle',
+    fill:         {'#F64040': '#FC46AD'},
+    radius:       {20: 80},
+    duration:     2000,
+    isYoyo:       true,
+    easing:       'elastic.inout',
+    repeat:       999,
+  })
+  .play();
+  ```
+  </ExampleCircle>
+</ClientOnly>
 
 Or maybe a loading animation?
 
-<ExampleSpinner height="200px" id="spinner">
-```js
-var loader = new mojs.Shape({
-  parent:           '#spinner',
-  shape:            'circle',
-  stroke:           '#FC46AD',
-  strokeDasharray:  '125, 125',
-  strokeDashoffset: {'0': '-125'},
-  strokeWidth:      4,
-  fill:             'none',
-  left:             '50%',
-  top:              '50%',
-  angle:            {'-90': '270'},
-  radius:           20,
-  isShowStart:      true,
-  duration:         2000,
-  easing:           'back.in',
-})
-.then({
-  angle:            {'-90': '270'},
-  strokeDashoffset: {'-125': '-250'},
-  duration:         3000,
-  easing:           'cubic.out',
-  onComplete () {
-    loader.replay(0); // create an infinite loop
-  }
-})
-.play();
-```
-</ExampleSpinner>
+<ClientOnly>
+  <ExampleSpinner height="200px" id="spinner">
+  ```js
+  var loader = new mojs.Shape({
+    parent:           '#spinner',
+    shape:            'circle',
+    stroke:           '#FC46AD',
+    strokeDasharray:  '125, 125',
+    strokeDashoffset: {'0': '-125'},
+    strokeWidth:      4,
+    fill:             'none',
+    left:             '50%',
+    top:              '50%',
+    angle:            {'-90': '270'},
+    radius:           20,
+    isShowStart:      true,
+    duration:         2000,
+    easing:           'back.in',
+  })
+  .then({
+    angle:            {'-90': '270'},
+    strokeDashoffset: {'-125': '-250'},
+    duration:         3000,
+    easing:           'cubic.out',
+    onComplete () {
+      loader.replay(0); // create an infinite loop
+    }
+  })
+  .play();
+  ```
+  </ExampleSpinner>
+</ClientOnly>
 
 Go creative!