chore(e2e): adds localStorage setup and teardown step

[johncowen]

Adds a gherkin step to add values to localStorage:

Given the localStorage
  """
    key:
        this:
           will: end
           up: json
           encoded: true     
  """

The root key will be the localStorage key, and the rest will get JSON stringified and used for the value. So the above will be:

| Key | Value                                                   |
| key | {"this": { will: "end", "up": "json", "encoded": true}} | 

We never use anything but this form of JSON encoding, and we shouldn't ever use anything else either.

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I also combined visit.ts here. We used to have this separate for reasons, but we no longer need it to be separate. (ln:103 down is just the contents of the deleted file)

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[slonka]

2 Qs