Document Bootstrap integration in 3rd Party Javascript section

On this section https://htmx.org/docs/#3rd-party

It would be very helpful to have a short note about [Bootstrap](https://getbootstrap.com/) integration. Bootstrap remains immensely popular and some challenges must be overcome:
1. Modals -> link to the example https://htmx.org/examples/modal-bootstrap/
2. Also modals: when a modal is already open, then reloaded after validation, the `htmx:after-settle` event should be used instead of `shown.bs.modal` to reinitialize it (say for example focus the first `input`)
3. When swapping with `hx-target="body"` the Bootstrap components (Dropdown, ...) stop working if the Bootstrap JS was included in `body`. Moving the Bootstrap `script` tag to `head` and adding `defer` fixes the issue without any additional code or performance impact.