Add post preview and fix multiple stylings in homepage

[hpar461]

Description

This adds post preview components inside the homepage, and also fixes a couple of minor UI/feature bugs. List of minor issues fixed through this pr are listed below:

• Changed logo color to blue color of our theme; #19467B.
• Fix redundant horizontal paddings in popular communities and popular posts.
• Changed background color of the post preview component to white (#FFFFFF) to match figma UI prototype.
• Implemented navigation functionalities of logo icon and pages element.

Also some formatting adjustments have been made to follow indentations of other source files in the repository.

Related Issue

Fixes #26

Type of change

• [x] New feature (enhancement)
• [x] Bug fix
• [x] Refactor

How Has This Been Tested?

• [x] Automated testing
• [x] Manual testing

Checklist:

• [x] Does a similar (open or closed) pull request not already exist?
• [x] Is the pull request head repository a fork repository?
• [x] Is the pull request compare branch a development branch?
• [ ] Is the code documented, particularly in hard-to-understand areas?
• [x] Does the code build without new warnings?
• [x] Has testing been performed that proves changes are effective and work?
• [x] Has a self- and/or peer-review of the code been performed?
• [x] Have dependent changes been merged and published in downstream modules?
• [x] Does all new and existing automated testing pass?
• [x] Is the person responsible for the repository assigned to the pull request?
• [x] Is the pull request linked to a project?
• [x] Is the pull request linked to a milestone?

For more information, refer to the Contributing Guidelines document.

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