If you have finished building/migrating your Drupal 8 site and you want your Drupal 7 website to be replaced by the Drupal 8 site, the following guide explains how to do it.
Steps
Important: Steps 1-2 are for admins who built their websites in test sites. If you built your D8 site in an official site then skip to step 3.
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Create an official Drupal site in web services. The site category should be Official website. The site name does not play a role since it will be replaced by the site name of your Drupal 7 website.
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After having created the website, visit
<name_of_D8_official_website>.web.cern.ch/_site/clone
and clone the content of your Drupal 8 test site. So the content should be cloned from your D8 test site to the D8 official site. -
After the website is cloned, open a Service Now ticket requesting your Drupal 7 website to be replaced by the Drupal 8 website. In order to boost the process, choose
Drupal Infrastructure
as support team. In the ticket you should mention the name of your old Drupal 7 website and also the name of your Drupal 8 website.
In both cases, after the process is done, the URL of your old Drupal 7 website will point to the new Drupal 8 website. Your Drupal 7 will not be lost, it will just have a new URL. For more info regarding it check @kosamara 's comment below.