feature: Make the footer responsive and add a github social handle

[Pritam12F]

Is your feature request related to a problem? Please describe.

The current footer on the website does not resize responsively on different screen sizes, it can be made better with some responsive styling and we can add a github social handle to the two repositories '100xdevs-cohort-2' and 'code100x' so that people can go to these repos directly from projects.100xdevs.com.

Describe the solution you'd like

I can make the footer responsive with some tailwind classes and add a Github social handle using the icon pack - 'react-simple-icons' already used in the project.

Additional context

Before:

before.mp4

After:

after.mp4

[Pritam12F]

@hkirat Please look into this