Docs for google cse setup

[AlanBCole]

• [x] websupport google account
• [x] add cse in google dashboard
• [x] add user in this dashboard to all ad free search results
• [x] add cse id to site's settings.php file
• [x] add sitemap to the other google dashboard
• [x] request page to be indexed
• [x] in help scout communicat with IT Support to verify the user added above
• [x] turn on the site search option in the site's UI

[AlanBCole]

closed with pr #30