Add a search as you type form

As in other places where we have a long list of things where you might
want to jump to a specific thing. We use this pattern where there are
more than 7 things, per the magical number 7[1]

1. https://en.wikipedia.org/wiki/The_Magical_Number_Seven,_Plus_or_Minus_Two

app/main/views/organisations.py

@@ -143,6 +143,7 @@ def organisation_dashboard(org_id):
             end=current_financial_year + 1,
         ),
         selected_year=year,
+        search_form=SearchByNameForm() if len(services) > 7 else None,
         **{
             f'total_{key}': sum(service[key] for service in services)
             for key in ('emails_sent', 'sms_cost', 'letter_cost')