feat!: allow registration of multiple users (#340)

feat: administration area
feat: add reset password functionality

includes/list_subscriptions.php

@@ -147,8 +147,9 @@
         }
     }
 
-    $query = "SELECT main_currency FROM user WHERE id = 1";
+    $query = "SELECT main_currency FROM user WHERE id = :userId";
     $stmt = $db->prepare($query);
+    $stmt->bindValue(':userId', $userId, SQLITE3_INTEGER);
     $result = $stmt->execute();
     $row = $result->fetchArray(SQLITE3_ASSOC);
     $mainCurrencyId = $row['main_currency'];