Generalize last reader exercise in examples (unoffensive)

See merge request !165

Fix broken link

See merge request !164

Update ch02-01-getting-started.md

See merge request !160

Fix broken link

See merge request !159

All markdown in the same folder

See merge request !158

Remove unfinished porting section

See merge request !157

Remove unused code. We can backlog issues regarding the sections removed in #138

Add mdbook-linkcheck plugin to the CI container

Closes #136

See merge request !155

Explicitly standardize on mdbook as our tool

See merge request !154

Cleaned up Introduction

See merge request !156

link to newer rust book for chapter on unsafes

See merge request !153

stub out ci file

See merge request redox-os/book!148

Consolidate Overview and Introduction chapters

See merge request redox-os/book!149

Download link and misc fixes in try_vm.md

Closes #130

See merge request redox-os/book!151

- change qemu command to reflect correct filename
- change wording for clarity

Add missing homebrew dependencies

See merge request redox-os/book!152

* Move overview and introduction files into a single folder
* Remove about_this_book.md We can add a guide to contributing to documentation,
  and mention the book there.
* Remove heartbleed case study This has been a stubbed out article for ~3 years.
  We might consider an article like this for a technical white paper,
  or a blog post, if someone gets inspired.
* Stub out design/drivers and design/memory files
* Remove will redox replace linux
* Differentiate: Philosophy, Why a New OS, Goals

Refs #134

book: add docs for the scheduler

See merge request !147

fixed two typos in documentation

See merge request redox-os/book!145

Book link fixes

See merge request redox-os/book!144

src/explore/explore.md contains a link to a "Utilities" file. This file
no longer exists (it was removed in commit 2854c9b0). In order to avoid
unnecessary 404-type errors, remove the link to this page.

The redox book contains some broken links throughout the various
markdown pages. Fix all broken links to existing pages (by using
relative paths only) such that the documentation can be used as
intended.

This reverts merge request !143