Jyrki Vesterinen 9bcb4bbf35 Convert README for manual images to Markdown
I also updated the filenames for the images, changed the recommended
format for screenshots other than "fullscreen" screenshots to PNG,
and removed the (no longer true) claim that the example places to create
the screenshots match where the English screenshots were taken.

Resolves #2856.

[ci skip]

(cherry-picked from commit 134a51204b730ff2123e2af5b19f1fae58aa0515)
2018-10-07 03:18:59 +00:00
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