Updates to web_guesser based on learner feedback

There were a few confusing parts that more than one of my students
stumbled on. One being the ERB extraction step, and another being the
new file creation step (creating a file in a folder from the parent
directory). I tried to clarify those steps, as well as fix any typos.
list formatting fix
update what get block should look like after refactor
Consolidate instructions that can all be performed from Sublime
Merge branch 'kjr/web-guesser'