Update deploy.md

[Rhythmicc]

Summary

docs folder shoule be copied to /docs before set workdir in Dockerfile

What kind of change does this PR introduce?

Docs

For any code change,

• Related documentation has been updated if needed
• Related tests have been updated or tests have been added

Does this PR introduce a breaking change? (check one)

• Yes
• No

If yes, please describe the impact and migration path for existing applications:

Related issue, if any:

Tested in the following browsers:

• Chrome
• Firefox
• Safari
• Edge
• IE

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[Koooooo-7]

Hi. @Rhythmicc
AFAIK, If you mount the docs into /docs when you run this container , there is unnecessary do the COPY.