[Emacs homepage] Updated EmacsRocks screencasts

[Nicolas Petton]

Hi again,

I just pushed an update with several improvements regarding the
EmacsRocks screencasts:

- I added the episode 15
- I cropped all videos so that the macOS window decoration is not
  visible
- I updated the screenshot previews with the default GNOME window
  decoration (see the attached screenshot).

Cheers,
Nico

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Screenshot from 2017-01-17 13-47-15.png
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