WebHost: Restore game name in description, don't hardcode archipelago.gg

 ArchipelagoMW#1820 added the game name to template export, but when ArchipelagoMW#2143 began
overriding the description in Javascript to name the preset it removed
the game name.

Also while I was here I figured we might as well not hardcode
https://archipelago.gg, since it can be useful to know if a YAML was
generated by some other Web Host (for example
http://archipelago.gg:24242 if coming from the beta site)

WebHostLib/static/assets/player-options.js

@@ -452,15 +452,15 @@ const exportOptions = () => {
   const preset = localStorage.getItem(`${gameName}-preset`);
   switch (preset) {
     case '__default':
-      options['description'] = `Generated by https://archipelago.gg with the default preset.`;
+      options['description'] = `Generated by ${window.location.origin} for ${gameName} with the default preset.`;
       break;
 
     case '__custom':
-      options['description'] = `Generated by https://archipelago.gg.`;
+      options['description'] = `Generated by ${window.location.origin} for ${gameName}.`;
       break;
 
     default:
-      options['description'] = `Generated by https://archipelago.gg with the ${preset} preset.`;
+      options['description'] = `Generated by ${window.location.origin} for ${gameName} with the ${preset} preset.`;
   }
 
   if (!options.name || options.name.toString().trim().length === 0) {