Improve header user, cart and checkout

[crftwrk]

This PR makes several improvements to the WC header-actions.

Where	Header actions
Default pages
Cart page
Checkout page
Account pages

Cart and checkout

• Mini-cart and offcanvas cart have been removed on both pages.
• If you are on cart-page, you are already in the cart and do not need cart twice.
• Checkout is not AJAX updated, so it was possible to empty cart in checkout so far without updating the checkout. Now, the mini-cart is replaced by a simple back-to-cart button. No issues there anymore and buyers are forced to checkout instead clearing the cart ;-)

Account

• User-toggler and offcanvas have been removed in all account pages. If you are on a account-page, you are already in the account and do not need account twice.
• This allows us to simply include my-account.php and remove own my-offcanvas-account.php in a separate PR. my-offcanvas-account.php is used for unique id's but this is not needed anymore. Less to maintain.

bootscore/template-parts/header/offcanvas-woocommerce.php

Line 22 in 7d7fbac

<?php include get_template_directory() . '/woocommerce/myaccount/my-account-offcanvas.php'; ?>

Testing

Tested it on several live-shops and works fine. It's already live on bootscore.me. Go to the shop https://bootscore.me/shop/, add a product an go to cart and checkout and account https://bootscore.me/account/.

What else? Added deny direct access to those files as described here #367.

@justinkruit I made sure to make no changes in files changed here #575. So, there is no conflict with this PR. If you like it, merge it!

[justinkruit]

Looks good to me! We could even expand this behavior in #575 and add filters to the ifs to always show them without the need to change the template part.

[crftwrk]

We could even expand this behavior in #575 and add filters to the ifs to always show them without the need to change the template part.

Yes, I'm in 👍