perf: Fetch articles in homepage only when visible

[memoyil]

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PR-Codex overview

The focus of this PR is to implement intersection observer for lazy loading articles in the News and Blog sections.

Detailed summary

• Added useIntersectionObserver for lazy loading articles in NewsSection and BlogCard
• Updated useAllNewsArticle and useLatestArticle to accept an enabled parameter
• Refactored the use of useAllNewsArticle and useLatestArticle in NewsSection and BlogCard components

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