update writer's guide for 0.1.3 release

- cleaned up links
- minor copyedits and added comments for future edits
- updated section example syntax
- added irc syntax
- added csv and dsv tables shorthand syntax
- added link role and window syntax
- updated doc toc placement and toc example
writer's guide edits, highlight.js updates

- organize document attributes
- use source listings for AsciiDoc examples, where applicable
- content revisions
- add footnote about doctype and level 0 sections
- add label style to highlight.js stylesheet
- add level 5 heading to highlight.js
formatting of first paragraph in 0.1.3 release blog