Fix links pointing to the staging environment (#18704)

CHANGELOG.md

@@ -2,4 +2,4 @@
 
 Font Awesome 6 is here! And with it a new location for the change log.
 
-Visit https://staging.fontawesome.com/docs/changelog/.
+Visit https://fontawesome.com/docs/changelog/.

README.md

@@ -31,8 +31,8 @@ Looking for older versions of Font Awesome? Check the [releases](https://github.
 
 From time-to-time we'll have special upgrading instructions from one version to the next.
 
-- [Web upgrading guide](https://staging.fontawesome.com/docs/web/setup/upgrade/)
-- [Desktop upgrading guide](https://staging.fontawesome.com/docs/desktop/setup/upgrade/)
+- [Web upgrading guide](https://fontawesome.com/docs/web/setup/upgrade/)
+- [Desktop upgrading guide](https://fontawesome.com/docs/desktop/setup/upgrade/)
 
 ## Code of conduct
 

UPGRADING.md

@@ -4,7 +4,7 @@ See the [CHANGELOG.md](./CHANGELOG.md) for detailed information about what has c
 
 Our upgrading guide has moved for version 6 to:
 
-- [Web](https://staging.fontawesome.com/docs/web/setup/upgrade/)
-- [Desktop](https://staging.fontawesome.com/docs/desktop/setup/upgrade/)
+- [Web](https://fontawesome.com/docs/web/setup/upgrade/)
+- [Desktop](https://fontawesome.com/docs/desktop/setup/upgrade/)
 
 As always, [submit issues](https://github.com/FortAwesome/Font-Awesome/issues/new) that you run into with this guide or with these upgrades to us.