Feat
- add precss
- make prompt character unselectable (20)
- add 'breadcrumbs_separator' option
- enable show_breadcrumbs option (24)
- **conf**: enable nav_include_hidden by default
- **nav**: enable hiding (21)
- **code**: add style for code block captions
- **code**: add styles for literal block
Fix
- **code**: linenumbers look decent
- **code**: copy button for literals stick
- **copyright**: fix alignment if show_nav=False
- removed dependency on semibold (14)