Xah Talk Show 2020-08-15, emacs/elisp tutorial, modify youtube linkify accept timestamp

• emacs M-x Donuts vs vim fitness
• online emacs meetup, hosted by our great Jeff T https://www.meetup.com/Emacs-SF/events/272601148
• modify xah-html-youtube-linkify to accept timestamp. e.g. https://youtu.be/mKkXW0sEwGQ?t=1989 becomes https://www.youtube.com/embed/mKkXW0sEwGQ?start=1989

xah_talk_show_2020-08-15.txt