Migrate functions to app package (#5106)

* Refactor and move session logic into app package

* Refactor email functions into the app package

* Refactor password update into app package

* Migrate user functions to app package

* Move team functions into app package

* Migrate channel functions into app package

* Pass SiteURL through to app functions

* Update based on feedback

utils/config.go

@@ -39,7 +39,7 @@ func GetSiteURL() string {
 }
 
 func SetSiteURL(url string) {
-	siteURL = url
+	siteURL = strings.TrimRight(url, "/")
 }
 
 func FindConfigFile(fileName string) string {