Use more descriptive errors for signup checks

src/api/auth.rs

@@ -17,12 +17,12 @@ use crate::util::error::{AuthError, Contextualize, Error, ErrorType};
 #[post("/api/v1/auth/signup", mut auth: Extension<AuthSession>, db_pool: Extension<DbPool>, config: Extension<Config>)]
 pub async fn signup(credentials: UserCredentials) -> Result<User> {
     if !config.auth.open_signup {
-        return Err(Error::new_here(ErrorType::Auth(AuthError::Unauthorized)));
+        return Err(Error::message_here("Signup is disabled"));
     }
 
     // Don't allow signup when already logged in
     if auth.user.is_some() {
-        return Err(Error::new_here(ErrorType::Auth(AuthError::Unauthorized)));
+        return Err(Error::message_here("Log out before creating an account"));
     }
 
     let hashed_creds = credentials