docs(IDE): remove old RuyiSDK IDE 0.0.3 download instruction

[weilinfox]

Summary by Sourcery

Documentation:

• Replace legacy RuyiSDK IDE 0.0.3 download and startup guidance with instructions to obtain Eclipse Embedded CDT and install the RuyiSDK IDE plugin.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Updates the IDE documentation to remove legacy RuyiSDK IDE 0.0.3 standalone download and startup instructions, replacing them with guidance to install the RuyiSDK IDE plugin directly in Eclipse Embedded CDT and a pointer on where to obtain Eclipse Embedded CDT.

File-Level Changes

Change	Details	Files
Replace legacy standalone RuyiSDK IDE 0.0.3 download and startup workflow with plugin-based installation guidance for Eclipse Embedded CDT.	Remove direct download URL for the archived RuyiSDK IDE 0.0.3 package and related architecture/JRE notes. Delete step-by-step instructions and screenshots for starting the old standalone IDE from an extracted tar.gz bundle. Add explanation that RuyiSDK IDE is no longer maintained as of 0.0.3 and should now be used as a plugin installed into Eclipse Embedded CDT. Add a link to the Eclipse Embedded CDT project page and note that it can be obtained from that site or other distribution channels.	IDE/index.md

Possibly linked issues

• #N/A: They address the same need: updating the main IDE docs from old 0.0.3 package to plugin-based installation.

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