Hey Explorers!

Here's a free update to the One Breath Left digital booklets. I've added:

• Tagging. The Operation Manual, Explorer's Handbook and Navigation Guide are all now tagged, which means they have additional support in place for screen readers and reflow. All images and diagrams have alt text. This was tested extensively with NVDA, so your mileage may vary with other screen readers.
• Bookmarks. All three booklets now have bookmarks for faster navigation through them.

If you catch any errors, let me know and I'll try to troubleshoot ASAP!

-- Brian