menu: Add Calendar link. Remove Donate link

config/_default/menus.en.toml

@@ -5,6 +5,12 @@
 name = "Conferences"
 weight = 1
 
+[[main]]
+parent = "Conferences"
+name = "Calendar"
+url = "/calendar"
+weight = 3
+
 [[main]]
 parent = "Conferences"
 name = "Seattle"
@@ -49,12 +55,6 @@ name = "Cowork"
 url = "/cowork"
 weight = 2
 
-[[main]]
-parent = "Explore"
-name = "Donate"
-url = "https://donorbox.org/handmadecities"
-weight = 4
-
 [[main]]
 name = "About"
 url = "/about"