big clean up of html/css and adjustments in js and .eex files + left menu now is html valid
remove deprecated stuff: TOC, filecontents, ul.summary, and other stuff
update formatter tests
Merge pull request #170 from eksperimental/html_structure3

Make Menu valid HTML + CSS cleanup
Revert "Merge pull request #170 from eksperimental/html_structure3"

It adds a double border and breaks some search functionality.

This reverts commit a370171ae7a8137b2bd332b473684b4772230bbc, reversing
changes made to 3f4f43597c55cf12af7b7e52759c4d9822cd856a.
Release v0.6.2