removed incorrect clause about github licenses, removed Katy title
Some formatting and flow changes:
* try to bring formatting of subheadings into consistency by promoting all bolded headings to hierarchichal headings
* add Paul Wilson as author
* initial directory changing and git checkout flow was not consistent with following commands
* added excercise around man pages and ls
* added comment on mental model of directory hierarchy
* labeled exercise at end of path section
* clarified conditions under which different ls commands were equivalent
* remove some spaces getting in the way of bold
A few more changes to be consistent and clear.
* q is for quit (mnemonics)
* tab completion seemed to have invalid examples/instructions
* made a table of less commands
* explained why less commands work in man
* redirection exercise was ambiguous: files that contain 4 in their contents, or whose names contain the number 4?
* mkdir is to 'make' a directory (mnemonics)
* combined sort exercise block
* Can we get some documentation on tables
* Seem to have the tables figured out - they need a header - annoying
* Clean up ambiguity between file and filename.
There is no executable in the boot-camps directory - need to cd to shell dir first.
Fix old typo on file size.
Added some words about the history command and bang-history # direct access.
Fixed this? git hell