✨ Add menu icon support and flexible search link

exampleSite/config/_default/menus.en.toml

@@ -1,7 +1,7 @@
 # -- Main Menu --
 # The main menu is displayed in the header at the top of the page.
 # Acceptable parameters are name, pageRef, page, url, title, weight.
-# 
+#
 # The simplest menu configuration is to provide:
 #   name = The name to be displayed for this menu link
 #   pageRef = The identifier of the page or section to link to
@@ -24,12 +24,22 @@
   name = "Users"
   pageRef = "users"
   weight = 30
-  
+
 [[main]]
   name = "GitHub"
   url = "https://github.com/jpanther/congo"
   weight = 40
+  [main.params]
+    icon = "github"
+    showName = false
+    target = "_blank"
 
+[[main]]
+  identifier = "search"
+  weight = 99
+  [main.params]
+    action = "search"
+    icon = "search"
 
 # -- Footer Menu --
 # The footer menu is displayed at the bottom of the page, just before