Organize folders

[fanny]

In order to improve our example comprehension, I've decided to group components related into modules. I know this is subject of judgment, but at least I saw this organization pattern many times, so I believe it's well adopted. Now the modules are organized as follows:

I'm totally open to closing this if y'll think it's not useful or change to another interesting organizational structure, so feel free to suggest things.

├── public
├── schema
└── src
    ├── __generated__
    ├── components
    ├── hooks
    ├── pages
    │   ├── IssueDetail
    │   │   └── __generated__
    │   └── Issues
    │       └── __generated__
    └── routing

• components: Contains foundational components used by other pages (e.g ErrorBoundary, SuspenseImage)
• hooks: Contains all hooks available on this project
• pages: Contains the modules for our routes and their own components

I've also created a new component called IssueDetailComment because we were copying-paste its content on IssueDetailComments and IssueDetailRoot

[voideanvalue]

Thanks for the pull request @fanny. I like the updated structure.

The files in src/__generated__/ are build artifacts created by relay-compiler and cannot be moved. I can merge this after those changes are reverted.