fix(en): capitalize TypeScript and JavaScript brand names

[kailauber]

Summary

The official spellings of these languages are TypeScript (per typescriptlang.org) and JavaScript (ECMA-262). The English docs already use the correct casing in the vast majority of places; this PR fixes the remaining 9 stragglers.

Changes (9 occurrences across 8 files)

Typescript → TypeScript:

• src/content/docs/en/guides/configuring-astro.mdx
• src/content/docs/en/guides/integrations-guide/sitemap.mdx
• src/content/docs/en/guides/typescript.mdx
• src/content/docs/en/guides/upgrade-to/v5.mdx (heading)
• src/content/docs/en/reference/content-loader-reference.mdx
• src/content/docs/en/reference/modules/astro-middleware.mdx
• src/content/docs/en/reference/modules/astro-zod.mdx (heading + body)

Javascript → JavaScript:

• src/content/docs/en/guides/syntax-highlighting.mdx

Notes

• English-only change; Lunaria will mark the affected pages as outdated for translators, which is the expected behavior.
• One edit changes a heading text (### Removed: configuring TypeScript during create-astro and #### Extracting a TypeScript type); the slug stays the same since Astro's heading-to-slug rules are case-insensitive, so no anchor links break.
• Verified there are no remaining \bTypescript\b or \bJavascript\b matches under src/content/docs/en/ after this change.

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[astrobot-houston]

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Tracked Files

File	Note
en/guides/configuring-astro.mdx	Source changed, localizations will be marked as outdated.
en/guides/integrations-guide/sitemap.mdx	Source changed, localizations will be marked as outdated.
en/guides/syntax-highlighting.mdx	Source changed, localizations will be marked as outdated.
en/guides/typescript.mdx	Source changed, localizations will be marked as outdated.
en/guides/upgrade-to/v5.mdx	Source changed, localizations will be marked as outdated.
en/reference/content-loader-reference.mdx	Source changed, localizations will be marked as outdated.
en/reference/modules/astro-middleware.mdx	Source changed, localizations will be marked as outdated.
en/reference/modules/astro-zod.mdx	Source changed, localizations will be marked as outdated.

Warnings reference

Icon	Description
🔄️	The source for this localization has been updated since the creation of this pull request, make sure all changes in the source have been applied.

[ArmandPhilippot]

Thank you for helping us stay consistent, and welcome! 🥳