Create a nginx_certbot_site resource to remove duplication

It creates a folder, the nginx vhost for certbot and HTTP redirects, and
also runs certbot and recreates the nginx vhost that includes the TLS
cert

site-cookbooks/kosmos-mastodon/recipes/default.rb

@@ -91,12 +91,6 @@ application mastodon_path do
               vapid_public_key: mastodon_credentials['vapid_public_key']
   end
 
-  directory "#{mastodon_path}/public/.well-known" do
-    owner node['nginx']['user']
-    group node['nginx']['group']
-    recursive true
-  end
-
   bundle_install do
     user "mastodon"
     deployment true