Add github link to this repo on Footer

[DeKal]

Spec:

• On the footer of the page, add a Github Logo to the right corner of footer
• When clicking to it, link to this repo https://github.com/DeKal/portfolio-next-js
• When hovering, give it a good color 💃

Note:

• Checking Github icon at https://react-icons.netlify.com/#/search
• Re-layout Footer content by Container, Row, Col of bootstrap