docs: start the server docker container separately

[TinsFox]

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[guchenhe]

you do need to start with source even when developing front end only, docker image releases can lag behind the head of main branch and it often does.

[TinsFox]

you do need to start with source even when developing front end only, docker image releases can lag behind the head of main branch and it often does.

I only added this guide because I saw the Start the frontend Docker container separately section in the documentation.

As you said, you should not start the front end separately, because the front end image may also lag behind.

In this case, we only need the Local Source Code Start chapter.