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By default, livecheck isn't able to check the stable URL for bluez, so it falls back to checking the Git tags from the homepage URL. This adds a livecheck block that checks the directory listing where the stable tarball is found. Besides that, this updates the homepage to bluez.org.

While we're at it, this adds a head URL and makes sure the HEAD build works. The test fails for head builds because bluetoothctl --version returns bluetoothctl: 5.79 but version.to_s is HEAD-dfb1ffd, so I've disabled that part of the test for HEAD installations. If there's a better way to handle it, I can update the test instead.