redesign documentation quickstart page
fix wording for bokeh interface levels and %bokeh command for notebooks
simplify quickstart examples and remove extra import lines
fix note style
add missing dependecies necessary to build the documentation
add more details about bokeh and examples directives
improve examples, add server side examples and add more information about bokeh design
add quickstart server side examples code
remove TODO comment
fix typos
update quickstart examples with new quickstart interface
update examples to use new plotting API
fix examples
Merge branch 'master' into task/improve_documentation
fix examples issues spotted during review
make quickstart log line example more readable
remove example not used
update quickstart animated line server example
Merge pull request #1398 from bokeh/task/improve_documentation

improve documentation