* conversion stage 1

* correct image paths

* add sidebar title to frontmatter

* docs/concepts and docs/internals

* configuration docs and multi-level nav corrections

* commands docs, index file corrections, small item nav correction

* secrets converted

* auth

* add enterprise and agent docs

* add extra dividers

* secret section, wip

* correct sidebar nav title in front matter for apu section, start working on api items

* auth and backend, a couple directory structure fixes

* remove old docs

* intro side nav converted

* reset sidebar styles, add hashi-global-styles

* basic styling for nav sidebar

* folder collapse functionality

* patch up border length on last list item

* wip restructure for content component

* taking middleman hacking to the extreme, but its working

* small css fix

* add new mega nav

* fix a small mistake from the rebase

* fix a content resolution issue with middleman

* title a couple missi...