added back button to game.html and FAQ page

[PankajR007]

PR Description 📜

Added Back button in the games.html Page
Added Back button in FAQ.html page.
Added a consistent footer in the about.html

Please include summary related to the issue you have fixed and describe your PR in brief over here by specifying the issue number on which you were working below
Fixes #440

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• [x ] I follow CONTRIBUTING GUIDELINE & CODE OF CONDUCT of this project.
• [ x] I have performed a self-review of my own code or work.
• [ x] I have commented my code, particularly in hard-to-understand areas.
• [ x] My changes generates no new warnings.
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@ayush-t02 I have fixed the issue #440 and rasied this PR. Please look into it.

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