ENH Move _string_to_bool from axes._base to cbook
DOC moved barh to new style MEP10 documentation
DOC added links between the barh documentation and the bar documentation
DOC small nitpicks
ENH improved the css style of the docs
Merge pull request #2184 from NelleV/doc_styling

ENH improved the css style of the docs
Merge pull request #2182 from NelleV/axes_module_plotting

[Sprint] ENH Move _string_to_bool from axes._base to cbook
Merge pull request #2183 from NelleV/MEP10_barh

DOC moved barh to new style MEP10 documentation