fixed: make serve unavailable

[fleeto]

What type of PR is this?

/kind documentation

What this PR does / why we need it:

Due to an error in the Dockerfile, the make serve command could not be completed. I adjusted the order of some instructions to fix the issue.

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

[RainbowMango]

@samzong Please take a look~

[pigletfly]

/lgtm

[karmada-bot]

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[RainbowMango]

@pigletfly So glad to hear from you! Long time no see, I hope you are doing well!

[fleeto]

echo "Docker image karmada-website:v0.1.0 exists"
Docker image karmada-website:v0.1.0 exists
docker run --rm -it --name karmada-website \
                -v /tmp/website:/app/docs \
                --workdir=/app/docs \
                -p 3000:3000 \
                karmada-website:v0.1.0
yarn run v1.22.22
$ docusaurus start --host 0.0.0.0 && sh start-watch.sh
/bin/sh: docusaurus: not found
error Command failed with exit code 127.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.
make: *** [serve] Error 127

asciinema

[samzong]

@fleeto Thanks for finding a bug, But i run at local for PR, it's failed.

can u help me?

[fleeto]

This is caused by the cache referenced by docker build.