feat: update welcome page

Author: Olivier Bonnaure

app/controllers/welcome_controller.lua

@@ -2,10 +2,7 @@ local app = {
 	index = function()
 		Page("welcome/index", "app")
 		-- or
-		-- local data = Adb.primary:Aql([[
-		-- 	FOR c IN customers LIMIT 10 RETURN c
-		-- ]]).result
-		-- WriteJSON(data)
+		-- WriteJSON({ "demo" => true })
 	end,
 }