Add safety princibles.

lib/runosaari_web/controllers/page_controller.ex

@@ -1,8 +1,8 @@
 defmodule RunosaariWeb.PageController do
   use RunosaariWeb, :controller
 
-  def covid19(conn, _params) do
-    render(conn, "covid19.html")
+  def safety(conn, _params) do
+    render(conn, "safety.html")
   end
 
   def privacy(conn, _params) do