* Added README with information about building/viewing the docs.
* Added arvados_workbench_host
* Can now specify baseurl, arvados_workbench_host, and arvados_api_host on the command line to override _config.yml
* Added liquid tag {% code 'file' as language %} for syntax highlighting via coderay
Updating and reorganizing tutorials based on new features and feedback.
Removed out of order link to next tutorial.
Reorganizing documentation work in progress, checkpointing so that Brett can start looking through it.
Finished first draft of tutorial running pipeline from workbench.
More documentation updates and reorganization.
Removed h1. titles from pages because it is now part of the page template.
doc: Suggest setting User in .ssh/config.
doc: Highlight `you` in the first script job spec.
doc: Update job1's expected output.

Pete changed this script so that the output filename has a leading
`./`.  This commit updates the tutorial to match.
doc: Consistent style for `you` in job-debug.
doc: Fix hello-world-fixed.py name in job-debug.
doc: Bold `you` in tutorial-parallel's job spec.
Added liquid template to link to next and previous pages.
Ran linkchecker and fixed links.
doc: Small bugfixes for first pipeline template.
doc: Consistent style in new pipeline tutorial.
doc: Consistent style in outside program tutorial.
doc: Improve flow of CLI pipeline run.

The previous version assumed that we already had a static pipeline
template.  That's no longer true under the current flow, so instruct
the user to make one at the start of the tutorial.
doc: Make CLI pipeline run up-to-date.

This refreshes Keep hashes and the output format of `arv pipeline run`.