docs: 📝 Add Code block

apps/docs/docs/editor/blocks/code.md

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+# Code
+
+The "Code" block allows you to execute Javascript code. If you want to set a variable value with Javascript, use the [Set variable block](./set-variable) instead.
+
+**It doesn't allow you to create custom visual block**
+
+<img src="/img/blocks/code.png" width="600" alt="Code block"/>
+
+## Examples
+
+### Reload page
+
+```js
+window.location.reload()
+```
+
+### Wait for 3 seconds
+
+By default, Promises will be awaited. So something like this will work:
+
+```js
+return new Promise((res) => setTimeout(res, 3000))
+```
+
+### Post a message to parent
+
+```js
+postMessage('hello there!', '*')
+```
+
+Then on your parent website you could listen for those messages:
+
+```js
+addEventListener('message', ({ data }) => console.log(data))
+```
+
+Do you need to do something but you're not sure how to? [Ask the community for help!](https://www.facebook.com/groups/typebot)