fix: remove DOM dependency from ArticleCard

[vaishnavi192]

Fixes: #683

Removed the browser-dependent document.createElement() usage from ArticleCard and replaced the HTML-to-text conversion with an SSR-safe utility using the existing html-react-parser dependency. This allows ArticleCard to render during Docusaurus server-side/static rendering without requiring browser APIs.

####Before Screenshot
Terminal output showing the Docusaurus build failing while rendering /ssrissue because document is unavailable.

Test File

After Screenshot

Terminal output showing the Docusaurus build completing successfully after removing the browser DOM dependency from ArticleCard.

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