Added missing "Setting up Ghost with SSL" section

Italian translation was missing "Setting up Ghost with SSL". Added the section, translated.
Merge pull request #2797 from aauri/patch-1

Added missing "Setting up Ghost with SSL" section
Update the raw URL for GitHub

closes Ghost-Config#25

see https://github.com/TryGhost/Ghost-Config/issues/25
Corrected a tiny grammar issue

Found a tiny grammar issue while reading. Thanks!
Merge pull request #2802 from aauri/patch-2

Corrected a tiny grammar issue
Updated some missing steps

Updated some missing steps in command line for mac, linux and for Droplet. Also made some corrections
Translated Quickstart Guide

Translated the rest of the Quickstart guide
Merge pull request #2813 from aauri/patch-1

Translated Quickstart Guide
Merge pull request #2808 from aauri/patch-2

Updated some missing steps
Added missing configuration options

Added the missing configuration options section, translated to Italian.
Merge pull request #2816 from aauri/patch-2

Added missing configuration options
Added missing/updated information and heading.

Added/updated information on File Structure and missing heading for Partials.
Merge pull request #2827 from aauri/patch-3

Added missing/updated information and heading.
Fixed typo.
Merge pull request #2934 from suryatech/patch-1

Fixed typo.
"Mailgun documentation update closes #2935
Merge pull request #2940 from orliesaurus/mailgun-doc

"Mailgun documentation update closes #2935
added tiny more details, nothing major
Merge pull request #2949 from orliesaurus/mail-fix

added tiny more details, nothing major (reference #2935)