CB-6680 Clarify instructions for installing via npm
CB-6739 Clarify pointers to install instructions

Be more clear about where the instructions are for installation. Also do a
little bit of wordsmithing regarding next steps and on the landing page.
CB-6739 Fix typo.
CB-5793 Update docs for ant-build vs bin
[CB-6717][amazon-fireos] Platform guide and other docs needs to be updated for amazon-fireos
Updated amazon-fireos platform guide as well as config and embeded webview guides.
CB-5793 Backport this doc to 3.4.0

Backport this doc change to 3.4.0 since this is where the new behavior
appeared.
Version 3.5.0
Add non-en docs for 3.5.0
Merge branch 'master' of https://git-wip-us.apache.org/repos/asf/cordova-docs