Minor fixes in docs

docs/app/components/appbar/style.scss

@@ -14,7 +14,6 @@
 .logo {
   width: $appbar-logo-size;
   height: $appbar-logo-size;
-  margin-top: ($appbar-height - $appbar-logo-size) / 2;
   fill: $color-primary-contrast;
 }
 

docs/app/components/layout/home/style.scss

@@ -94,7 +94,7 @@ $content-width: 740px;
       margin: 0 $unit;
     }
     .twitter {
-      color: $twitter-color;
+      color: $twitter-color !important;
     }
   }
   > p {

docs/app/components/layout/main/modules/examples/input_example_1.txt

@@ -13,7 +13,7 @@ class InputTest extends React.Component {
         <Input type='text' multiline label='Multiline' maxLength={20} value={this.state.multiline} onChange={this.handleChange.bind(this, 'multiline')} />
         <Input type='email' label='Email address' icon='email' value={this.state.email} onChange={this.handleChange.bind(this, 'email')} />
         <Input type='tel' label='Phone' name='phone' icon='phone' value={this.state.phone} onChange={this.handleChange.bind(this, 'phone')} />
-        <Input type='text' value={this.state.hint} label='Required Field' hint='With Hint' required onChange={this.handleChange.bind(this, 'hint')} icon={<span>J</span>} />
+        <Input type='text' value={this.state.hint} label='Required Field' hint='With Hint' required onChange={this.handleChange.bind(this, 'hint')} icon='share' />
       </section>
     );
   }