Removed Memes and Added some contests related photos

[kartik1000]

Description

Removed Memes and added Contest related pictures which are relatively more meaningful.

Fixes #73

[kpbot]

Hello @kartik1000, it seems like you have referenced #73 in your pull request description, but you have not referenced them in your commit message description(s). When you reference an issue in a commit message, it automatically closes the corresponding issue when the commit is merged.

Please run git commit --amend in your command line client to amend your commit message description with Fixes #73..

An example of a correctly-formatted commit:

commit fabd5e450374c8dde65ec35f02140383940fe146
Author: kpbot
Date:   Sat Mar 18 13:42:40 2017 -0700

    pull requests: Check PR commits reference when issue is referenced.

    Fixes #51.

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