chore: update example page data

apps/editor/examples/data/md-default.js

@@ -2,44 +2,39 @@
 const content = [
   '![image](https://uicdn.toast.com/toastui/img/tui-editor-bi.png)',
   '',
-  '# Heading 1',
-  '## Heading 2',
-  '### Heading 3',
-  '#### Heading 4',
-  '##### Heading 5',
-  '###### Heading 6',
-  '',
-  '**bold** *italic* ~~strikethrough~~',
-  '<span style="color:#e11d21;">Color Syntax</span>',
-  '[link](https://nhn.github.io/tui.editor/)',
-  '',
-  '---',
-  'horizontal line',
-  '***',
-  '',
-  '> block quote',
-  '>> block quote (2 depth)',
-  '>>> block quote (3 depth)',
-  '',
-  '* list',
-  '    * list indented',
-  '1. ordered',
-  '2. list',
-  '    1. ordered list',
-  '    2. indented',
-  '',
-  '- [ ] task',
-  '- [x] list completed',
-  '',
-  '`inline code`',
-  '',
-  '    code block',
+  '# Awesome Editor!',
+  '',
+  'It has been _released as opensource in 2018_ and has ~~continually~~ evolved to **receive 10k GitHub ⭐️ Stars**.',
+  '',
+  '## Create Instance',
+  '',
+  'You can create an instance with the following code and use `getHtml()` and `getMarkdown()` of the [Editor](https://github.com/nhn/tui.editor).',
+  '',
   '```js',
-  'console.log("fenced code block");',
+  'const editor = new Editor(options);',
   '```',
-  '<pre>**HTML block**</pre>',
   '',
-  '| table | head |',
-  '| ----  | ---- |',
-  '| table | body |'
+  '> See the table below for default options',
+  '> > More API information can be found in the document',
+  '',
+  '| name | type | description |',
+  '| --- | --- | --- |',
+  '| el | `HTMLElement` | container element |',
+  '',
+  '## Features',
+  '',
+  '* CommonMark + GFM Specifications',
+  '    * Live Preview',
+  '   * Scroll Sync',
+  '   * Auto Indent',
+  '    * Syntax Highlight',
+  '        1. Markdown',
+  '        2. Preview',
+  '',
+  '## Support Wrappers',
+  '',
+  '> * Wrappers',
+  '>    1. [x] React',
+  '>    2. [x] Vue',
+  '>    3. [ ] Ember'
 ].join('\n');