prepare RC img based on user stable, announce on pine forums to get testing feedback

[bhush9]

We now have a image based on user-edition : http://files.kde.mirror.pangea.pub/neon/images/pinebook-remix-nonfree/neon-pinebook-remix-useredition-20180730-1137-arm64.img.gz

(It is not hosted on kde.org server due to publishing script breaking, will be fixed in next image)

[bhush9]

The images are now at : https://files.kde.org/neon/images/pinebook-remix-nonfree/useredition/

[star-buck]

done and closed