Initial verification sweep for account sign ups

[akristen]

This PR adds minor adjustments to sign up procedures in prerequisite sections.

• Adding one word verified to instances of Docker account in prerequisite sections is a subtle, unobtrusive change that returning, verified users can gloss over, while still prompting new users to verify their email if they haven't yet.
• Changes stick to specific instances in ## Prerequisite sections and does not add verified to every instance (which would be obtrusive).
• Edits to Create Account doc to remove redundant callouts, consolidate steps for shorter procedures, and add context about verification.
• If an instance of Docker account links to /create-account and not the sign up page, I did not add verification.
  • Note: we may want to consider a direct link to a sign up page rather than linking them to a create account page. This can be a separate PR, however.

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[aevesdocker]

LGTM!