[CB-3827] change Project Settings to Configuration
[CB-3827] list Upgrading guides within Platform Guides; rm redundant "Cordova"
[CB-3827] separate platform-specific CL tool guides; still needs cleanup
[CB-3827] rm 'Command-Line Usage' sect; correct prev commit to add separate CL tools guides within Platform sects
[CB-3827] Remove explicit HTML links to Command-Line Usage section; fix other HTML links to privacy section
[CB-3827] Remove other hard-coded HTML links
[CB-3827] rename & list WebViews sections within Platforms
[CB-3827] rename 'getting-started' dirs as 'platforms'
[CB-3827] move platform-specific files within platforms dir; rename dirs within platforms
[CB-3827] fixed problem where supposed '.md' file actually became directory
[CB-3827] redirect hard-coded HTML links based on new dir structure
[CB-3827] rename img dirs & redirect links
[CB-3827] suppress display of firefoxos content
[CB-3827] remove comment that screws up Markdown formatting