feat(v2): official CodeSandbox support (#3717)

* feat:added support for codesandbox

* added sandbox config file

* feat:added script to generate template for codesandbox

* added examples:generate script to package.json file

* added failing path to eslintignore

* added script to eslintignore

* added cleaning feature to script

* deleted sandbox script in root

* changed comment in codesandboxscript file

* update codesandboxscript.js + revert bad package.json changes

* eslint should check codesandboxscript

Co-authored-by: slorber <lorber.sebastien@gmail.com>

examples/bootstrap/docs/mdx.md

@@ -0,0 +1,17 @@
+---
+id: mdx
+title: Powered by MDX
+---
+
+You can write JSX and use React components within your Markdown thanks to [MDX](https://mdxjs.com/).
+
+export const Highlight = ({children, color}) => ( <span style={{
+      backgroundColor: color,
+      borderRadius: '2px',
+      color: '#fff',
+      padding: '0.2rem',
+    }}>{children}</span> );
+
+<Highlight color="#25c2a0">Docusaurus green</Highlight> and <Highlight color="#1877F2">Facebook blue</Highlight> are my favorite colors.
+
+I can write **Markdown** alongside my _JSX_!