Change the Logo to MLH Prep logo (Issue #5)

[beatrixcendana]

Please, go through these steps before you submit a PR.

• [X] My Pod Leader knows I'm working on this Pull Request
• [X] I've explained what the Pull Request is adding.
• [X] I've explained why this is important.

I have changed the logo to MLH Prep Fellowship logo.

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[beatrixcendana]

Added and resized image for issue #6

[beatrixcendana]

I closed this PR and I will start over another one for a new branch. I will do Issue 6, Victoria will do issue 5, and Mostafa will do issue 7. Sorry about the mess! -- Beatrix