Replace `jquery.ajax` with generic `fetch`

[Cheezmeister]

3dprinterstatus/index.php

Line 33 in 8dc2c28

<script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>

https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API/Using_Fetch

We'll lose an unneeded net request and a (really) tiny bit of attack surface area.