Refactor users management (#6)

* Improve second factor removal by admin

src/data/user.rs

@@ -45,6 +45,15 @@ pub struct TwoFactor {
 }
 
 impl TwoFactor {
+    pub fn quick_description(&self) -> String {
+        format!(
+            "#{} of type {} and name '{}'",
+            self.id.0,
+            self.type_str(),
+            self.name
+        )
+    }
+
     pub fn type_str(&self) -> &'static str {
         match self.kind {
             TwoFactorType::TOTP(_) => "Authenticator app",