Promote the Language Selector to Site Level

[sean1588]

trafficstars

Issue details

Make language selection global to the site instead of having it on individual language choosers.

implementation is TBD, but here is an example from Torian's doc: https://apidocs.chargebee.com/docs/api/

This will require building out a global toggle component for this and changing the language choosers we currently wrap most code blocks with on the page. We also need to get the templates updated as well since we hard code these pulumi-choosable and pulumi-chooser components there.

• [ ] #3930
• [ ] #3931
• [ ] #3932
• [ ] #3933

Affected area/feature