Introduced Piwik as an optional plugin

Change-Id: I57d6961ac9e922e1a661ea94a5a6c7563688ed0b
diff --git a/kalamar.conf b/kalamar.conf
index e194d0a..4d4e94e 100644
--- a/kalamar.conf
+++ b/kalamar.conf
@@ -27,6 +27,10 @@
 # - CHI
 #     See Mojolicious::Plugin::CHI
 
+# For Plugins,
+# - Piwik
+#     See Mojolicious::Plugin::Piwik
+
 # The default Kustvakt api endpoint
 my $api = 'http://localhost:9999/api/';
 {
@@ -47,16 +51,15 @@
     # The name of the base corpus,
     # for query examples (see kalamar.queries.dict)
     # examplecorpus => 'dereko'
+
+    # For further Plugins, add them
+    # to this array:
+    # plugins => []
   },
 
   # See Mojolicious::Plugin::TagHelpers::MailToChiffre
   'TagHelpers-MailToChiffre' => {
     method_name => 'PArok',
     pattern_rotate => 673
-  },
-
-  # See Mojolicious::Plugin::Piwik
-  Piwik => {
-    embed => 0
   }
 }