add shellcheck option to the doc and sort options by theme (#85)
add shellcheck option to the doc and sort options by theme (#85)

* add shellcheck options to the doc

* sort option by theme

* correct text for shellcheck option

neersighted/ale,hernot/ale,adriaanzon/ale,BuffaloCoder/ale,doits/ale,neersighted/ale,neersighted/ale,prashcr/ale,breed808/ale,hernot/ale,esran/ale,hernot/ale,BuffaloCoder/ale,w0rp/ale,IngoHeimbach/ale,breed808/ale,w0rp/ale,breed808/ale,w0rp/ale,IngoHeimbach/ale,IngoHeimbach/ale