Shelly Cloud installation guide

Shelly Cloud guide: error correction, polishing

Shelly Cloud guide: remove br tags, fix Step 13 link

Shelly Cloud guide: replace html #, clarifications

Shelly Cloud guide: make it more neutral
Merge pull request #2503 from szymonpk/master

Refinery installation on Shelly Cloud platform
Fixed some of the formatting in the Shelly Cloud guide.
Shelly Cloud guide: simplify
Merge pull request #2508 from szymonpk/master

Shelly Cloud guide: simplify
Test Ruby 2.1.0.