Updates the rules button and other interface buttons. (#18917)

the rules button now redirects to the rules page instead of using broken
html

---------

Signed-off-by: Matt Atlas <mattiathebest2000@hotmail.it>
Co-authored-by: Matt Atlas <liermattia@gmail.com>

code/controllers/configuration.dm

@@ -250,6 +250,7 @@ GLOBAL_LIST_EMPTY(gamemode_cache)
 	var/wikiurl
 	var/forumurl
 	var/forum_passphrase
+	var/rulesurl
 	var/githuburl
 
 	//Alert level description
@@ -646,6 +647,9 @@ GENERAL_PROTECT_DATUM(/datum/configuration)
 				if ("forumurl")
 					GLOB.config.forumurl = value
 
+				if ("rulesurl")
+					GLOB.config.rulesurl = value
+
 				if ("forum_passphrase")
 					GLOB.config.forum_passphrase = value