Add documentation on rendering ViewComponents outside of the view context (#2065)

Closes #201

Author: joelhawksley

docs/CHANGELOG.md

@@ -10,6 +10,10 @@ nav_order: 5
 
 ## main
 
+* Add documentation on rendering ViewComponents outside of the view context.
+
+    *Joel Hawksley*
+
 * Look for preview files that end in `preview.rb` rather than `_preview.rb` to allow previews to exist in sidecar directory with test files.
 
     *Seth Herr*

docs/guide/getting-started.md

@@ -120,3 +120,11 @@ class PagesController < ApplicationController
   end
 end
 ```
+
+### Rendering ViewComponents outside of the view context
+
+To render ViewComponents outside of the view context (such as in a background job, markdown processor, etc), instantiate a Rails controller:
+
+```ruby
+ApplicationComponent.new.view_context.render(MyComponent.new)
+```