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    <title>API Documentation</title>
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    <h1>Welcome to the API!</h1>

    <h2>How to utilise this API:</h2>
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        <strong>POST /signup :</strong> Register a new user. The payload should be a JSON object containing 'username' and 'password' keys.
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        <strong>POST /login :</strong> Authenticate an existing user. The payload should be a JSON object with 'username' and 'password' keys. This endpoint returns a JWT token when successful.
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        <strong>GET /logout :</strong> Invalidate a user's JWT token. This endpoint does not require a payload.
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