Fix tag and container port on docker.md

[TheFockinFury]

Fixes:

1. Change latest tag to match version number
2. Correct container port from 4173 to 3000

Description

Note that either this doc will need to be updated again as versions increment, or a latest tag needs to be created.

PR Tasks

• [x] Open PR
• [x] run npm run test:unit
• [x] run npm run format

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