Fix redirect_from formatting in index.md

[skyeyeye]

fix: remove unused redirect_from field in homepage front matter

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🚦 Lighthouse Results (Mobile & Desktop)

URL	Device	Perf	A11y	Best Practices
/	mobile	🔴 61	🟢 100	🟢 96
/en/blog/posts.html	mobile	🟢 99	🟢 96	🟢 96
/en/5x/api.html	mobile	🟢 98	🟢 95	🟢 96
/	desktop	🟢 99	🟢 100	🟢 96
/en/blog/posts.html	desktop	🟢 98	🟢 96	🟢 92
/en/5x/api.html	desktop	🟢 100	🟢 95	🟢 96