fix: update links in Navbar and add OlaOluwalekan to contributors

[OlaOluwalekan]

About Me

Name : Olalekan Bello (@OlaOluwalekan)

Tick the check boxes below if true :

• [X] I learnt to use Git and GitHub.

• [X] This is my first time contributing to Open Source.

• [X] I want to contribute more to Open Source.

On a scale of 1 - 10, 1 being very easy and 10 being hard, how difficult did you find it to create a pull request ? : 8

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