fix: make Supporters CTA host-safe

[RedZapdos123]

• Please check if the PR fulfills these requirements

• The commit message follows our guidelines.
• Tests for the changes have been added (for bug fixes / features).
• Docs have been added / updated (for bug fixes / features).

Which issue(s) this PR fixes:
Fixes #854.

• What kind of change does this PR introduce?

Bug fix.

• What is the current behavior?

The homepage Supporters header CTA hardcodes https://kubeedge.io/${i18n.currentLocale}/docs/community/supporters and opens a new tab without rel="noopener noreferrer".

• What is the new behavior ?

The CTA now points to a current-host-safe locale path and adds rel="noopener noreferrer" while preserving the existing new-tab behavior.

• Does this PR introduce a breaking change?

No.

• Other information:

• Verified with npx -y yarn@1.22.22 install --frozen-lockfile.
• Verified with npx -y -p node@20 --call "node ./node_modules/@docusaurus/core/bin/docusaurus.mjs build".
• Verified with npx -y prettier@3.3.3 --check src/components/supporters/index.js.
• Proof was checked from the generated built homepage Supporters CTA before and after the fix.

Before the fix:

After the fix:

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[gemini-code-assist]

Code Review

This pull request cleans up trailing spaces in the supporters list and updates the community supporters link to use a relative path instead of an absolute URL, while also adding rel="noopener noreferrer" for security. The reviewer suggests using Docusaurus's built-in <Link> component instead of a raw <a> tag to automatically handle locale prefixes, base URLs, and security attributes, which would also allow removing the unused i18n context.

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