Created Pagination Functionality & Improved Styling of Pagination Component

[andrewkykoo]

Pull Request Template

Description

1. Created pagination functionality in the leaderboard.
2. Added styling to the pagination component.

https://user-images.githubusercontent.com/47183818/197318284-3c56d37c-9bc4-455b-a0b0-cfa24e443d48.mov

Note(s)

• There are existing unused variables and imports in HacktoberBoard and LeaderBoardPagination that can be removed.
• leader_board_pagination class is commented out as it was not doing anything. This can be removed upon request.

Fixes # 171

Type of change

Please delete options that are not relevant.

• [x] New feature (non-breaking change which adds functionality).

Checklist:

• [x] My code follows the style guidelines of this project.
• [x] I have performed a self-review of my own code.
• [x] My changes generate no new warnings.
• [x] I have checked my code and corrected any misspellings.

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