PLT-5900 Removed automatic configuration of SiteURL (#5952)

* Revert "PLT-5765 Passed SiteURL to SendNotifications (#5705)"

This reverts commit a8e68bd890.

* Removed automatic configuration of SiteURL

* Reverted unintentional config changes

* Updated help text

* Added link to docs in Site URL warning

* Fixed merge conflict

config/config.json

@@ -1,6 +1,6 @@
 {
     "ServiceSettings": {
-        "SiteURL": "",
+        "SiteURL": "http://localhost:8065",
         "ListenAddress": ":8065",
         "ConnectionSecurity": "",
         "TLSCertFile": "",
@@ -55,10 +55,10 @@
         "CustomDescriptionText": "",
         "RestrictDirectMessage": "any",
         "RestrictTeamInvite": "all",
-        "RestrictPublicChannelCreation": "all",
-        "RestrictPrivateChannelCreation": "all",
         "RestrictPublicChannelManagement": "all",
         "RestrictPrivateChannelManagement": "all",
+        "RestrictPublicChannelCreation": "all",
+        "RestrictPrivateChannelCreation": "all",
         "RestrictPublicChannelDeletion": "all",
         "RestrictPrivateChannelDeletion": "all",
         "RestrictPrivateChannelManageMembers": "all",