Feature/Setup dynamic routing

[ericahagle]

Description

• Add Routes/Route to App.js
• Add new fetch for individual movie
• Render selected movie based on id
• Gets back and forward browser buttons working

Screenshot(s)

Here, you can see the id showing up in the URL (but also that the CSS is fakakta):

Notes

• I had to do a good bit of restructuring to get this stuff working—especially of note that the useEffects have moved to Movies.js and MovieDetails.js
• Implementing Router seems to have wreaked a little havoc on our CSS, so we'll need to dig into that in a separate ticket/PR, because I was only able to get it part way there so far
• Also planning to make some updates to our visual error messaging in a subsequent ticket/PR because Router did some funky stuff with them, too

Checklist

• [x] My PR has an appropriately descriptive and concise title.
• [x] My code follows the Turing Style Guides and best practices.
• [x] I ran the code locally and verified that there are no visible errors.
• [x] feat: My PR clearly describes what feature I'm adding and any changes needed to make it work.
• [x] refactor: My PR clearly describes what code I'm refactoring and why.

[ericahagle]

I keep thinking that I've got it, but I can't get this to properly render the selected movie. I think I just need to go sleep and maybe have better luck tomorrow. Previous commit just saves my work where I'm leaving it for now.

@rjsturing If you see what I'm missing, please let me know or feel free to pull down this branch and then push changes up to the PR!