Make compatible with omd 1.0.0
Merge branch 'master' into 'omd'
-- initial import of the OCaml teaching resources page
-- created learn/teach.md
- moved teach.md under /learn
- amended teach.md to refer to existing sections on the site
Put the JavaScript in a HTML block
Make Code.highlight return an Omd.t value
- renamed teach.md to teaching-ocaml.md
- teaching-ocaml has new content
Make comment clearer
Adapt eval & syntax highlighting to the latest omd
Basic tutorial: show the latest error message

The evaluation is done in a <div> block that is hidden.
Basic tutorial: use the right UTF-8 symbol for em-dash
99problems: Fix title & code within list
added teaching-ocaml.md
Update teaching page with @yansh

Still some placeholders for further updates. Should review
sections with current educators for feedback.
* added a reference to an additional book in the textbook section
* added introductory text to the Browser section
samll edit and typo fixing
minor edit and typo fixing
minor edit and typo fixing
minor edits