Add Newsletter on the Footer

The main objective is to add a newsletter to the main footer with the _**substack org**_ link

```
<iframe src="https://devrhylmenewsletter.substack.com/embed" width="480" height="320" 
style="border:1px solid #EEE; background:white;" frameborder="0" scrolling="no"></iframe> 
```

**Link:-** https://substack.com/@devrhylmenewsletter