Improve UI of reading blogs

[A7abhilash]

Feature request-

Improve UI of reading blogs in the route /posts/:postId.

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Describe the solution you'd like

I shall be using simple bootstrap cards to render the UI which looks minimalistic. The currently displayed contents(blog title, blog content and comments shall all be there in the new UI also along the the link to the author's profile).

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Additional context

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gssoc21

[A7abhilash]

/assign

[github-actions[bot]]

This issue has been assigned to @A7abhilash! It will become unassigned if it isn't closed within 21 days. A maintainer can also add the pinned label to prevent it from being unassigned.

[A7abhilash]

@Pranav016 @RushanKhan1 This issue can be closed now because I had already pushed the code for this also along with last PR(#444) itself (so in the last PR, I have cleared two issues- #442 & #446(this one), I wanted to make a separate PR for this issue but unknowingly I had pushed already the code and made a pr....).