Don't need to be removing manually

src/routes.rs

     let password = env::var("ADMIN_PASSWORD")?;
     let user: User = req.body_form().await?;
     if user.username == username && user.password == password {
-        req.session_mut().remove("logged_in");
         req.session_mut().insert("logged_in", true)?;
         redirect("/")
     } else {
 }
 
 pub async fn logout(mut req: Request<State>) -> Result {
-    req.session_mut().remove("logged_in");
     req.session_mut().insert("logged_in", false)?;
     Ok(Redirect::new("/").into())
 }