Integrate article header image into navigation bar

[MatthewTurk247]

We will be using React Native components to modify the Post.js file located in the screens folder. You can access the code by using git clone -b dev https://github.com/TheStanfordDaily/stanforddaily-mobile.git in the terminal. You are going to need to figure out most of this on your own since I do not have a straightforward idea of how to implement this, although I can offer some advice. Learn about React Navigation and then try to make the header bar transparent. After that, play around with the marginTop of the ImageBackground component on line 96. Do not hesitate to reach out with questions. Have fun!