move reST section to filters/rst.rst

* wrote custom autosimple directive to include docstring without
  the signature
* require docutils ≥ 0.9 to have support for math and code directives
remove unkown JS highlighter with highlight.js and new directive
use docutils' native code block directive, but retain previous aliases
add `view` target to docs/Makefile
move filters/rst.rst to filters/markup/rst.rst
add markup/md.rst and markup/other.rst
split pre and post filter docs into separate files
move built-in filter refs to the top of filter docs
fix some docutils warnings
move view docstrings to views/*.rst
merge idea.rst and about.rst

* remove plugins, libs used
* remove thanks section, see AUTHORS
* remove "nikola" from incremental compilation trivia fact (it does
  also incremental compilation)
Merge branch 'feature/refactor-docs'
Merge branch 'master' of github.com:posativ/acrylamid
fix Mako support