Use Cow's CSS syntax extension instead of embedding CSS strings
Add zurb foundation css/js files from upstrem
Install files in `static/` into the `~/.opam/doc-static` directory at installation time.
update gitignore
Switch to Zurb styles in HTML generation
begin merging the Zurb and existing CSS
Embed the OPAM doc content inside Zurb responsive container
More of a shift to Zurb: add breadcrumbs instead of the `Up` link, and fix up CSS for top navbar.

Add placeholder searchbar.
move css file in right place
fix some of the font headings (this can be factorized out later)
Further improvements to CSS, and disable external highlighting
Fix panel and callout css, and header sizes to reasonable values
improve code layout by tagging all values with `odoccode` and rendering them separately.

This should let us mark the odoccode with their source code locations too.
Do not initialise hljs
sticky navbar, and fix up the table layouts
add a footer to every page
add footer css, and more for the html headers
Make the main page not fill up to the right for large displays (only for small ones)
bump working version to 0.9.3
Always record and print backtraces from the driver