Podcast transcripts with elfeed & speech recognition engine

So, I've already done some weird things with elfeed. This time, it's running speech recognition to get podcast transcripts. Hope you find that interesting :)

> For obvious reasons, podcasts rarely ship with transcripts. Why don't they actually? It can be quite annoying for those hard of hearing or when listening to someone with an accent that greatly differs from those you're used to. Pretty neat use of Vosk.

your work with elfeed and emms has been pretty cool, but this is definitely a step up! good job

From firsthand experience, because transcripts are time consuming or expensive to create. I'm editing the output of autogenerated subtitles to create an accurate transcript of a talk I gave last month, and the factors you brought up that make audio hard to process also make speech recognition unreliable and in need of significant edits (in my case, lots of non-English names too). I'm committed to finishing and uploading the transcript, but doing the work myself gave me a whole new level of respect for the process.

Thank you!