🐛 Fix share link backward compatibility with cached bundle.js

Why:
- If somebody has a cached version of the site's JavaScript from before
  the latest release, which didn't have cache-control headers that would
  force timely revalidation, then opening a new shared link would
  produce a page not found error. We can remove the "#" only after the
  old site is no longer in any browser's cache.

web/js/pages/TerritoryPage.tsx

@@ -22,7 +22,8 @@ const ShareButton = ({congregationId, territoryId, territoryNumber}) => {
   const togglePopup = async () => {
     if (!shareUrl) {
       const url = await shareTerritory(congregationId, territoryId);
-      setShareUrl(url + '/' + encodeURIComponent(territoryNumber).replaceAll(/%../g, "_"));
+      // TODO: change "#/" to a "/" after nobody has a cached page older than 2023-07-31, to avoid incompatibility with the old router
+      setShareUrl(url + '#/' + encodeURIComponent(territoryNumber).replaceAll(/%../g, "_"));
     }
     setOpen(!open);
   }