Drupal 8.x

Hello,

I have a d8 eCom site using the commerce module. Another person built the site. I looked at the folder structure and I noticed that sites, modules, and themes folders do not exist at the root level. Rather exists at root/web directory. Normally, all my d8 sites have the sites, modules, and themes folders at the root directory. 

I am migrating the site to another server. I am running into an issue. 

good morning I'm using Comerce 2 and Drupal 8

I already have it working and when doing some tests I realized that it only sent the email with the invoice and the order confirmation to the email of the customer who made the purchase.

I would like to know if you can also send an email with the purchase confirmation to the business email.

awaiting your attention.

On Drupal 7 I remember that it was possible to create a block and activate a parameter to let users choose if they want to hide it.

How to let the user choose to no longer display a block on Drupal 8 ?

How to create a Facets with price ranges ?

I want the Facets to display for example :
0 to 10 €
10 to 100 €
100 to 150 €
...

I found this module which corresponds to my research, but it is for Drupal 7 and I am on drupal 8 :

https://www.drupal.org/project/facet_api_dynamic_ranges

Currently the Facets displays all available prices :

https://ibb.co/nbFq6r8

I created a link in the purchase tunnel to render a page in a modal window. Here is an overview :

https://ibb.co/bJyrxr5

https://ibb.co/480mM35

I want to modify this module, to replace the page rendered by the "cgv" display mode of store types in a modal window. What should I put in code to do this ?

I'm migrating my site to a new theme. I'm using a theme switcher module so that I can build the new pages on production while still keeping the old theme. The new pages have the same URLs as the old pages, but with on small difference, for example:
/products --> old theme URL
/new/products --> new theme URL