Start with first guide - using arethusa-cli
Grammar
Add section 2 to first guide
Consistency
Add section 3 to plugin guide
Add section 4 about retrievers
Add sections up to the first green spec
Add retriever communication to guide
Add a warning for early readers
First part of coding the actual retriever
Typos
First green retriever spec
Second passing retriever spec
Clarification why retrievers exist
Typo
Remove early reader warning
added missing protocol on bourbon.io link
grammar
misc grammer/typo cleanup
missing/inconsistent quotes in spec conf