DEV: Add PluginOutlets above and below blocks (#42)

Author: markvanlan

javascripts/discourse/templates/components/right-sidebar-blocks.hbs

@@ -1,3 +1,5 @@
+<PluginOutlet @name="above-right-sidebar-blocks" />
+
 {{#each blocks as |block|}}
   <div class={{block.classNames}}>
     {{component block.name params=block.parsedParams}}
@@ -6,4 +8,6 @@
     @name="below-right-sidebar-block"
     @outletArgs={{hash block=block}}
   />
-{{/each}}
+{{/each}}
+
+<PluginOutlet @name="below-right-sidebar-blocks" />