Fix TextField usage in Usage.md page (#3328)

* Fix TextField usage in Usage.md page

* Remove duplicate code snippet and remove image

Author: ethanshar

docs/getting-started/usage.md

@@ -8,30 +8,7 @@ title: 'Usage'
 This is a quick example of how to use our basic components, modifiers and presets to generate a good looking screen.  
 For detailed information please go over the other sections: [Style](../foundation/style.md), [Modifiers](../foundation/modifiers.md), Components...
 
-![basic showcase](basic-showcase.png).
-
-```jsx
-import React, {Component} from 'react';
-import {View, TextField, Text, Button} from 'react-native-ui-lib';
-
-export default class Example extends Component {
-  render() {
-    return (
-      <View flex paddingH-25 paddingT-120>
-        <Text blue50 text20>
-          Welcome
-        </Text>
-        <TextField text50 placeholder="username" grey10 />
-        <TextField text50 placeholder="password" secureTextEntry grey10 />
-        <View marginT-100 center>
-          <Button text70 white background-orange30 label="Login" />
-          <Button link text70 orange30 label="Sign Up" marginT-20 />
-        </View>
-      </View>
-    );
-  }
-}
-```
+<!-- ![basic showcase](basic-showcase.png). -->
 
 ```jsx live
 function Example(props) {