fix frontend warnings

front/src/routes/bots.jsx

@@ -1,6 +1,6 @@
 import Modal from "react-modal";
 import { useAuthContext } from "../context/auth_context";
-import { useEffect, useState, useCallback } from "react";
+import { useEffect, useState } from "react";
 
 Modal.setAppElement("#root");
 
@@ -147,7 +147,7 @@ const BotButton = ({ onSave, givenBot }) => {
 };
 
 export const BotCard = ({ botStruct, onSave }) => {
-  const { name, token } = botStruct;
+  const { name } = botStruct;
   return (
     <div className="key-card">
       <h4>{name}</h4>

front/src/routes/man_pages.jsx

@@ -74,7 +74,11 @@ export const ManPages = () => {
             <li>
               In the "Previous Games" viewer, use "m" to show the game's move
               history in UCI notation (which you may convert to PGN{" "}
-              <a href="https://www.dcode.fr/uci-chess-notation" target="_blank">
+              <a
+                href="https://www.dcode.fr/uci-chess-notation"
+                target="_blank"
+                rel="noreferrer"
+              >
                 here
               </a>
               ).