Frontend: Added payment button and redirect to order confirmation

[Jul-S]

Description

After clicking Paypal button on Order review Page user will be redirected to a window with payment system and on Success to order Confirmation page. Order status is chanegd to payed in DB

Additionaly added:

1. api route to change order status: PATCH api/orders
2. authorisation on OrdersPage - user can only see his orders
3. payment button will not show if order status is not payed

Fixes #216

How to test?

npm run dev => create order => click paypal button => Login to payment with test user (ask me)

Checklist

• [x] I have performed a self-review of my own code
• [x] I have followed the name conventions for CSS Classnames and filenames, Components names and filenames, Style filenames, if you are in doubt check the the project README.MD and here https://github.com/HackYourFuture-CPH/curriculum/blob/master/review/review-checklist.md
• [x] I have commented my code, particularly in hard-to-understand areas, if you code was simple enough mark the box anyway
• [x] I have made corresponding changes to the documentation, if you code was simple enough mark the box anyway
• [x] This PR is ready to be merged and not breaking any other functionality