Add more YAML specific features to comparison

[anatoly-scherbakov]

• 88 Update .gitignore

• 88 Link → YAML-LD Primer

• 88 All mentions of Extended Profile → separate section

• 90 Compare JSON vs YAML

• Add more YAML specific features

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[gkellogg]

Note that even though YAML can use UTF-16 and -32, we would restrict to using UTF-8, to be compatible with both JSON-LD and RDF Concepts.