Docs: create a new "Hello World" tab
Hello docs: add Additional Resources section
Hello docs: work on Introduction section
Hello docs: describe what files to create/change for the new pattern to work
Hello docs: Defining a Pattern section
Hello docs: Pattern Registration section
Hello docs: Using the Pattern section
Hello docs: garden
Hello docs: state assumtions in the Introduction section
Hello docs: grammar
Hello docs: update Defining the Pattern section
Hello docs: add a temporary word of caution at the top
Hello docs: "Adding Configuration Options to a Pattern" section
Hello docs: changes to "Using the Pattern on a Page" section
Hello docs: the Options Format section
Hello docs: Nesting the Options section
Hello docs: add title of the new section (Writing Tests)
Hello docs: style <span> hover cursor (imitating <label> even better)
Hello docs: Writing Tests section (~1st half)
Hello docs: more of Writing Tests section