Docs: Bluetooth: Update qualification page

With the new Bluetooth Qualification process the QDID and link to
launchstudio are outdated, remove them.

Also remove the ICS listing as it hasn't been updated for a while.
Instead add a download link to the Zephyr Bluetooth Host ICS file.

Update the documentation configuration script to include the ICS file
(`*.pts`) in the external contents.

Signed-off-by: Théo Battrel <theo.battrel@nordicsemi.no>