resolves #165 groups and organizes user manual sections

- moderately changes the names of some sections
- moves output types to document processing part
- moves doctypes to build your document part
- moves ToC section to navigating part
- groups blocks sections
- groups elements sections
- moves macros section
- adds output types to processing partintro
- removes asciidoc output types
- combines discrete section titles with sections
- creates creating custom output part out custom output sections