New header template adds full control over search field on desktop and
mobile, which now allows for autocomplete suggestions on the
results page
Also fixed autocomplete results format, since opensearch requires a
suggestions response of [<original query>, [<suggestion array>]]
Added <meta name="referrer" content="no-referrer"> to all whoogle
templates
Refactored search route to use conditionally use either request.args or
request.form, depending on rest call (get vs post respectively)
