docs: fix uninstall command in EIM guide (IDFGH-17435)

[TinyuZhao]

Description

fix uninstall command in EIM guide docs

Related

EIM docs:https://docs.espressif.com/projects/idf-im-ui/en/latest/cli_commands.html#commands-overview

Checklist

Before submitting a Pull Request, please ensure the following:

• 🚨 This PR does not introduce breaking changes.
• All CI checks (GH Actions) pass.
• Documentation is updated as needed.
• Tests are updated or added as necessary.
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Note

Low Risk
Low risk documentation-only change that updates the CLI command name; no runtime or API behavior is modified.

Overview
Updates the Get Started uninstall instructions (EN and zh_CN) to use the correct EIM CLI command for removing a specific ESP-IDF version, changing eim uninstall <version> to eim remove <version>.

^{Written by Cursor Bugbot for commit f914468. This will update automatically on new commits. Configure here.}

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[espwangning]

Thanks for the contribution! LGTM. I will sync to our internal codespace for pipeline check.

[espwangning]

sha=6cdffe3c5555914f738c459919cad56e85da8194

[krzychb]

sha=6cdffe3c5555914f738c459919cad56e85da8194

[espwangning]

sha=44c77cbf46844cd056c923277ece745173cb270d

[krzychb]

sha=44c77cbf46844cd056c923277ece745173cb270d

[krzychb]

sha=f91446802d23d5f901f00e80d0008416eef7d1c7