Add documentation to website.

As HTML, as well as in the form of an archived docset.
Update the landing page.

To properly format inline code; to remove UIAElement macros from the example
(see e1c0219733f6df0aa045587aef838c0c0ca3821c); to align the wording with the
blog post.
Fix broken image in documentation index.
Update the documentation's index aka the README.
Ignore some more .DS_Store files.
Update the documentation's index (aka the README) to make reference to the documentation.
Remove Travis build status from documentation index aka the README.

It was kinda cool to see it in the Organizer but the status of master is also
kinda irrelevant to a developer using a specific version of the project.
Fix typo in index/README.
Fix a broken link in documentation index.
Adjust website title and tags.
Remove WWDC event description from website.
Fix bug in code sample.
Add readme-image showing the Choose Plist File... button
Merge pull request #149 from MaxGabriel/choosePlistFile

Add readme-image showing the "Choose Plist File..." button
Remove the text shadowing on paragraphs