Update deployment.md

[danfein]

Update docker compose port to match docker and docker Quickstart sections

Category:

One of: Documentation

Overview

The port number in the docker compose section (4000) was out of sync with the documentation for the docker and quickstart sections (8080)

Issue Number (if applicable) #00

New Vars (if applicable)

n/a

Screenshot (if applicable)

If you've introduced any significant UI changes, please include a screenshot

Code Quality Checklist (Please complete)

• All changes are backwards compatible
• All lint checks and tests are passing
• There are no (new) build warnings or errors
• (If a new config option is added) Attribute is outlined in the schema and documented
• (If a new dependency is added) Package is essential, and has been checked out for security or performance
• (If significant change) Bumps version in package.json

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