Backport PR
#4174: various issues in markdown and rst templates...
Backport PR
#4174: various issues in markdown and rst templates
- remove prompts from default output
- add missing HTML block
- remove double-wrapping of latex
- use plain-markdown indentation for code blocks (could use GFM ``` ` ` `python```)
- images didn't work in either one at all
- markdown extracts output
closes
#4024
candidate for backport to 1.1
