refactor(docs): separate Pages site source (#6176)

* refactor(docs): separate Pages site source

* fix(docs): preserve published guide pages

* fix(ci): run asset ownership tests for site changes

* fix(docs): track future website media

* fix(ci): let Pages deployments finish

* build(deps): update Pages checkout action

* fix(ci): follow moved setup guide

* fix(docs): repair published setup guide

* fix(docs): retarget preview encoder

.github/workflows/docker-publish.yml

@@ -14,6 +14,8 @@ on:
     paths-ignore:
       - '**.md'
       - 'docs/**'
+      - 'website/**'
+      - 'assets/branding/**'
       - '.github/ISSUE_TEMPLATE/**'
 
 concurrency: