[CB-5122] 'Platform Guide' => 'Installation Guide'
[CB-5122] 'SoAndSo Command-line Tools' => 'SoAndSo Development Guide'
[CB-3962] many 'your' => 'the'
[CB-5122] redo intro to Install guides
[CB-5122] indent code into blocks
[CB-5122] rename shell 'tools' guides to 'Development' guides
[CB-5122] rename 'Platform' guides to 'Installation' guides
[CB-5122] even filenames need to use parallel verb tense
[CB-5122] rewrite intro to Android Development Guide
[CB-5122] rewrite intro to iOS Development Guide; massage android
[CB-5122] rewrite intro to WP Development Guide
[CB-5122] clarify plugman is x-plat
[CB-5122] This 'section' => 'guide'
[CB-5122] custom WebView as advantage of shell workflow
[CB-5122] clarify CLI/sh tools for Android install
[CB-5122] for precedures, bullet => number lists
[CB-5122] better describe plugman & scope of devel doc
[CB-5122] merge platform's install & shell info
[CB-5122] renamed main platform files back to index.md
[CB-5122] rename platform 'Installation Guide' back to 'Platform Guide'