Cards and other changes

[maenad]

Pull Request Template

Hey there,

Thank you for contribution and walking with crea8lab in this awesome journey. Here are a few tips to help you make successful PRs

• Update your local copy after you've committed your changes.
• If any conflicts, resolve them accordingly.
• Take screenshots of your display... how does what you've done look in the browser?
• Go to your github account and send a PR from there with the screenshot attached to it.

Happy hacking

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Full list of changes

• Added cards as per card issue.
• Beautified the footer (more padding on the bottom so it wouldn't look weird)
• Fixed the form-control dropdown since the words were getting cut off due to its height.
• Updated readme to add MDN documentation for HTML, CSS and JavaScript (the link was broken).
• Fixed font size
• Fixed font background in carousel for better legibility.

#64

[maenad]

Can we add the #hacktoberfest label to this, please?