fix: sitemap regex

[Music47ell]

The current regex removes any mention of .js|.tsx|.mdx|.md in the file name and changes the slug when generating a sitemap.

Example: /blog/my-new-nextjs-reactjs-portfolio.mdx becomes /blog/my-new-nex-reac-portfolio

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Latest commit: 50da158

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[timlrx]

Sorry for the much delayed reply. That fixes the problem but it also introduces a new one. Files adding with feed.xml are wrongly processed. Let me just modify the regex to match on .js|.tsx|.mdx|.md at the end of string rather than globally.