navbar_autocomplete config item to disable main navbar autocomplete

Netdisco/lib/App/Netdisco/Manual/Configuration.pod

@@ -103,6 +103,12 @@ database:
  netdisco=> update users set port_control = true where username = 'guest';
  netdisco=> update users set admin = true where username = 'guest';
 
+=head3 C<navbar_autocomplete>
+
+Value: Boolean. Default: C<true>.
+
+Set this to C<false> to disable the device autocomplete in the main navbar.
+
 =head3 C<suggest_guest>
 
 Value: Boolean. Default: C<false>.

Netdisco/lib/App/Netdisco/Web/TypeAhead.pm

@@ -8,6 +8,8 @@ use Dancer::Plugin::Auth::Extensible;
 use App::Netdisco::Util::Web (); # for sort_port
 
 ajax '/ajax/data/devicename/typeahead' => require_login sub {
+    return '[]' unless setting('navbar_autocomplete');
+
     my $q = param('query') || param('term');
     my $set = schema('netdisco')->resultset('Device')->search_fuzzy($q);