Switch from provide to content_for

since we are not using or calling streaming anywhere in the app

Ref: https://api.rubyonrails.org/classes/ActionController/Streaming.html

Author: Elle Meredith

app/views/pages/show.html.erb

@@ -1,4 +1,4 @@
-<% provide :page_title, @page.title %>
-<% provide :page_description, @page.description %>
+<% content_for :page_title, @page.title %>
+<% content_for :page_description, @page.description %>
 
 <%= @page.body %>