documentation open topics

[daringer]

• [x] fill contribute.md
• [x] add links all over the configuration reference and in between the examples for quick navigation
• [ ] add image for each example
• [ ] create a separate 'quick-start', instead of linking 'basics'
• [ ] add id documentation to sort/strict section #39
• [ ] remove deprecated documentation #38
• [ ] add hidden example (machine-readable vs. human-readable) to sort/strict section #39