UX: add "discovery" option, plugin outlet (#30)

javascripts/discourse/components/search-banner.js

@@ -17,6 +17,8 @@ export default Component.extend({
       return this.siteSettings.top_menu
         .split("|")
         .any((m) => `discovery.${m}` === currentRouteName);
+    } else if (showOn === "discovery") {
+      return currentRouteName.startsWith("discovery.");
     } else {
       // "all"
       return (

javascripts/discourse/templates/components/search-banner.hbs

@@ -2,6 +2,7 @@
   <div class="custom-search-banner">
     <div class="wrap custom-search-banner-wrap">
       <h1>{{html-safe (theme-i18n "search_banner.headline")}}</h1>
+      <PluginOutlet @name="search-banner-below-headline" />
       <p>{{html-safe (theme-i18n "search_banner.subhead")}}</p>
       {{mount-widget widget="search-widget"}}
     </div>

settings.yml

@@ -4,6 +4,7 @@ show_on:
   choices:
     - top_menu
     - homepage
+    - discovery
     - all
   description: top_menu refers to the <a href="/admin/site_settings/category/all_results?filter=top_menu">top menu site setting</a>