Docs: editorial cleanup, update examples and references, standardize formatting

* Rename Tutorial to Learn
* Fix typos, spellcheck
* Editorial changes and updates to the deployment section
* Add a link to Rok's video at the Wine and Beer Sprint
* Update Learn to match changes in mockup
* Getting Started: Editorial changes
* Replace html with markdown
* Reformat using semantic linefeeds
* Fix the sample JavaScript code so the lint tests pass
* Fix (Makefile) Typo on bundles
Docs, LEARN: Add "HowTo: Convert a jQuery Plugin to a Pattern"
Merge pull request #372 from plone/docs-jquery-plugin

HowTo: Convert a jQuery Plugin to a Pattern