SC17: reworked module file tutorial section (#5657)

* Reworked module file tutorial section

First draft for the SC17 update. This includes:

 - adding an introduction on module files + Spack's module
   generation blueprints
 - adding a set-up section and provide a docker image for easy set-up
 - updating all the relevant snippets
 - extending a bit some of the concepts that were already touched

* Added reference to #5582 + committed Dockerfiles

Also fixed a couple of typos spotted by Denis.

* module file tutorial: added section on template customization

* module file tutorial: fixed minor typos + rephrased a sentence

* module file tutorial: made explicit that Docker image comes with software

* module file tutorial: improved phrasing and layout.

Thanks Hartzell!

* module file tutorial: added vim and nano to editors

* module file tutorial: fixed typo

* Fixed typos

Thanks Adam!

* module file tutorial: updated Dockerfile + minor changes in introduction

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