v2.16.3

• 🐛 Fix a bug when building from sdist, where relative paths to files in the package didn't work because the working directory was wrong (#1687)
• 🛠 Adds the ability to disable mounting the host filesystem in containers to /host, through the disable_host_mount suboption on CIBW_CONTAINER_ENGINE.
• 📚 A lot of docs improvements! (#1708, #1705, #1686, #1679, #1667, #1665)