Nt 545 transition from thanks page to project page

[Scollaco]

📲 What

• Changes the way we present the Thanks page (modally instead of using a push animation).
• Brings users back to the ProjectPage once they back a project.

🤔 Why

• The transition changed because the animation was inconsistent, where the ViewController was being presented with a push animation but being dismissed with a modal animation.
• To improve UX, user can now see right away the Project Page updated with the status of their backing.

JIRA ticket

🛠 How

• By changing the implementation of the dismissToRootViewController from self?.view.window?.rootViewController?.dismiss(animated: true, completion: nil) to self?.dismiss(animated: true, completion: nil)

• To push the ThanksVC with a modal animation, an UINavigationController extension was created. It contains a function pushViewControllerModally that imitates the animation of the present(viewController:animated:) function.

👀 See

Trello, screenshots, external resources?

Before 🐛	After 🦋

✅ Acceptance criteria

• Back a project and on the Thanks Page, tap the X button. The ThanksPage should be dismissed (with no animation) and you should be brought to the Project Page.
• The CTA button of the ProjectPage should be updated according to the current status of the backing (e.g. Manage)

[justinswart]

Nice! Ship it when tests pass!