vtt-compactor: slightly less verbose VTT files.

I'm working on a small project that involves interviewing a number of folks to capture their experience becoming and working as a Staff engineer. Hopefully the first stories will be ready to post in a couple of weeks, but what I've been surprised by is just how tricky it can be to get good interview notes.

So far Zoom's record meeting has been phenomenal because it produces a text transcript in the VTT format that's extremely "good enough" to edit into an interview. However, the format is a...