Move gh-pages branch files into /docs and add test files

- Jekyll ignore `/docs` and `/test` folders when using from root
- Update Staticman config to point to correct branch and data file location
- Replace `{{ base_path }}` references with `absolute_url` filter
- Update documentation

docs/_pets/lhasa-apso.md

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+---
+title: "Lhasa Apso"
+excerpt: "The Lhasa Apso is a non-sporting dog breed originating in Tibet."
+---
+
+> The Lhasa Apso (/ˈlɑːsə ˈæpsoʊ/ lah-sə ap-soh) is a non-sporting dog breed originating in Tibet. It was bred as an interior sentinel in the Buddhist monasteries, to alert the monks to any intruders who entered. Lhasa is the capital city of Tibet, and apso is a word in the Tibetan language meaning "bearded", so, Lhasa Apso simply means "long-haired Lhasa dog". There are, however, some who claim that the word "apso" is a form of the Tibetan word "rapso", meaning "goat-like", which would make the equivalent translation "wooly Lhasa dog".
+
+> <cite>From Wikipedia, the free encyclopedia</cite>

docs/_pets/tabby.md

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+---
+title: "Tabby"
+excerpt: "A tabby is any domestic cat that has a coat featuring distinctive stripes, dots, lines or swirling patterns, usually with a mark resembling an 'M' on its forehead."
+---
+
+> A tabby is any domestic cat that has a coat featuring distinctive stripes, dots, lines or swirling patterns, usually together with a mark resembling an 'M' on its forehead. Tabbies are sometimes erroneously assumed to be a cat breed. In fact, the tabby pattern is found in many breeds, as well as among the general mixed-breed population. The tabby pattern is a naturally occurring feature that may be related to the coloration of the domestic cat's direct ancestor, the African wildcat, which (along with the European wildcat and Asiatic wildcat) has a similar coloration.
+
+> <cite>From Wikipedia, the free encyclopedia</cite>