Removed attach button (#197)

Co-authored-by: giacomo <Giacomo.Rocchetti@diatechpharmacogenetics.com>

frontend/src/components/ChatInterface.tsx

@@ -53,22 +53,6 @@ function ChatInterface(): JSX.Element {
     <div className="chat-interface">
       {initialized ? <MessageList /> : <InitializingStatus />}
       <div className="input-container">
-        <button className="attach-button" type="button" aria-label="file">
-          <svg
-            width="24"
-            height="24"
-            viewBox="0 0 24 24"
-            fill="none"
-            xmlns="http://www.w3.org/2000/svg"
-          >
-            <path
-              fillRule="evenodd"
-              clipRule="evenodd"
-              d="M9 7C9 4.23858 11.2386 2 14 2C16.7614 2 19 4.23858 19 7V15C19 18.866 15.866 22 12 22C8.13401 22 5 18.866 5 15V9C5 8.44772 5.44772 8 6 8C6.55228 8 7 8.44772 7 9V15C7 17.7614 9.23858 20 12 20C14.7614 20 17 17.7614 17 15V7C17 5.34315 15.6569 4 14 4C12.3431 4 11 5.34315 11 7V15C11 15.5523 11.4477 16 12 16C12.5523 16 13 15.5523 13 15V9C13 8.44772 13.4477 8 14 8C14.5523 8 15 8.44772 15 9V15C15 16.6569 13.6569 18 12 18C10.3431 18 9 16.6569 9 15V7Z"
-              fill="currentColor"
-            />
-          </svg>
-        </button>
         <input
           type="text"
           value={inputMessage}