Added a navbar for responsive screen

[abhishekdubey1]

Added a navbar so that doesn't overlap in devices with screen width less than 1100px

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If you're making a change to documentation, do not modify a .html file directly. Instead find the corresponding .pug file or test case in the test/docs directory.

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[vkarpov15]

Normally we wouldn't accept this PR since it modifies an HTML file directly, but in this case the docs are so out of date that there's no other option.

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[abhishekdubey1]

Thanks for approving the pull request. I came upon this page from Google searching for a solution to a problem I was facing.