516 compatibility for browsers (#20652)

this is a bit of

https://github.com/cmss13-devs/cmss13/pull/8646
https://github.com/cmss13-devs/cmss13/pull/8875
https://github.com/cmss13-devs/cmss13/pull/8606
https://github.com/cmss13-devs/cmss13/pull/8607
https://github.com/cmss13-devs/cmss13/pull/8359
https://github.com/cmss13-devs/cmss13/pull/7860
( and thus https://github.com/ParadiseSS13/Paradise/pull/25105
https://github.com/ParadiseSS13/Paradise/pull/25205
https://github.com/ParadiseSS13/Paradise/pull/25363
https://github.com/ParadiseSS13/Paradise/pull/26423 and
https://github.com/ParadiseSS13/Paradise/pull/26433 )
https://github.com/tgstation/tgstation/pull/89766

in order to work properly - using the efficient storage method, instead
of the byond json method - github pages needs to be enabled and built
from the gh-pages branch. because yeah

---------

Co-authored-by: harryob <55142896+harryob@users.noreply.github.com>

code/controllers/configuration.dm

@@ -477,6 +477,8 @@ GLOBAL_LIST_EMPTY(gamemode_cache)
 	var/asset_cdn_webroot = ""
 	var/asset_cdn_url = null
 
+	var/storage_cdn_iframe = "https://aurorastation.github.io/aurora.3/iframe.html"
+
 GENERAL_PROTECT_DATUM(/datum/configuration)
 
 /datum/configuration/New()
@@ -1087,6 +1089,9 @@ GENERAL_PROTECT_DATUM(/datum/configuration)
 				if("asset_cdn_url")
 					asset_cdn_url = (value[length(value)] != "/" ? (value + "/") : value)
 
+				if("storage_cdn_iframe")
+					storage_cdn_iframe = value
+
 				else
 					log_config("Unknown setting in configuration: '[name]'")
 
@@ -1181,6 +1186,8 @@ GENERAL_PROTECT_DATUM(/datum/configuration)
 	load_away_sites_config()
 	load_exoplanets_config()
 
+	Master.OnConfigLoad()
+
 /datum/configuration/proc/save_logging_config()
 	rustg_file_write(json_encode(GLOB.config.logsettings), "config/logging.json")
 	rustg_file_write(json_encode(GLOB.config.logfiles), "config/logging_files.json")