docs: clarify node response property support
adding docs on how to add multiple middleware at once. #157
docs: cleanup middleware guide, including TJ's yoda-style conditionals

changes on top of 789c30f9266758ae691d32be5bd87e23b1bca4e0. closes
#158, closes #157
examples: remove a few already migrated with tests
res: 205 is a no body response code too!

not sure anyone cares enough about this for a test. plus, it’ll still
“work”