docs: rework stuff The existing docs were far from how we wanted it to be. There was so much to do and it is not feasible to do that cleanup it in clean patches. Instead, I took a sweep through the docs and changed what I thought could benefit from a change: structure, examples, advices, language, markup, content, etc.

syntax: glob
*.pyc
*.swp
*.sqlite
*.tox
*.egg-info
*.egg

syntax: regexp
^rcextensions
^build
^dist/
^docs/build/
^docs/_build/
^data$
^sql_dumps/
^\.settings$
^\.project$
^\.pydevproject$
^\.coverage$
^kallithea\.db$
^test\.db$
^Kallithea\.egg-info$
^my\.ini$
^fabfile.py
^\.idea$