fix menu
Revert "Revert "Merge pull request #165 from eksperimental/html_structure""

This reverts commit 2264c7609aeec1a09d014764fae162c1c8036a28.
Merge pull request #167 from eksperimental/html_structure

fix menu
use highlight-js for code block elixir syntax highlighting
Merge pull request #168 from tonini/use-highligh-js

use highlight-js for code block elixir syntax highlighting