docs: document create-rsbuild --no-git option

[chenjiahan]

Summary

create-rsbuild now initializes a Git repository by default, but the quick-start guide still asks users to run git init and omits the --no-git opt-out from its CLI reference. This PR updates the English and Chinese guides to describe the default behavior, remove the stale manual step, and document --no-git.

Related Links

• feat(create-rsbuild): support --no-git #8237
• feat(create-rspress): support --no-git rspress#3594

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[chatgpt-codex-connector]

Show the npm argument separator for --no-git

For the primary npm command shown immediately above, appending the flag as npm create rsbuild@latest --no-git does not pass it to create-rsbuild; npm consumes it as its own git=false configuration. npm's bundled npm-init documentation under “Forwarding additional options” explicitly maps initializer arguments using npm init foo -- --hello, so users following this text will still get a Git repository. Show the package-manager-specific invocation—npm create rsbuild@latest -- --no-git for npm—and make the same clarification in the mirrored Chinese text.

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