Add new lightning documentation for Gen1 and Gen2

also updates what's new
fixed spelling mistake in what's new
wording changes
small wording change
small tweaks from lou's feedback
I in IoT docs and samples in whats new
formating change
Merge pull request #126 from IoTDan/develop

Updated Docs: What's new for Lightning, Arduino Wiring, Node.JS and Gen2
Refactor Samples
Updated for release
default to new for sample
Merge pull request #130 from ooeygui/develop

Develop
Fix serial link
Merge pull request #131 from ooeygui/develop

Fix serial link
Remove build break for Lightning on RGBPixel
Fixup the content for release
Merge pull request #132 from ooeygui/develop

Remove build break for Lightning on RGBPixel
Fix minor flow issue
Merge pull request #133 from ooeygui/develop

Fix minor flow issue
Added instructions to use v2.2.0 specifically
- Last known good version for Galileo