Build performance optimizations

[delucis]

Description

• Aims to improve some build performance by avoiding some well-known slower operations
• Updates a few places dealing with trailing slashes to use our existing trailing slash utilities instead of using .replace() with a regular expression
• Updates the stripExtension() utility in sidebar generation to use lower-level string operations instead of a regular expression in .replace(). (In this case the logic is technically subtly different as the RegExp was matching \w+ after a final period, but given the limited scope of usage for this utility on file paths ending in .md, .mdx etc., it should be fine.)
• Updates the slugToParam() utility to avoid an unnecessary .replace() in favour of a faster .slice()
• Refactors some slug processing in linkFromInternalSidebarLinkItem() to avoid the need to .replace() entirely

[changeset-bot]

🦋 Changeset detected

Latest commit: af29d34

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@astrojs/starlight	Patch

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[netlify]

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Lighthouse	1 paths audited Performance: 100 (no change from production) Accessibility: 100 (no change from production) Best Practices: 100 (no change from production) SEO: 92 (no change from production) PWA: - View the detailed breakdown and full score reports

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[astrobot-houston]

size-limit report 📦

Path	Size
/index.html	5.95 KB (0%)
/_astro/*.js	21.93 KB (0%)
/_astro/*.css	13.81 KB (0%)

[HiDeoo]

Lovely changes 🔥