Grammar & Wording Fixes in Docs

[Noisyxl]

"notated" → "noted" (correct meaning in context)
Fix article usage (File: relevant doc)

"place index markdown file" → "place an index markdown file" (missing article)

"for header on every" → "for headers in every" (plural & correct preposition)

"translating the website to your language" → "translating the website into your language" (correct usage)

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Lighthouse	7 paths audited Performance: 47 (🔴 down 6 from production) Accessibility: 92 (🔴 down 3 from production) Best Practices: 87 (🔴 down 9 from production) SEO: 98 (no change from production) PWA: 59 (no change from production) View the detailed breakdown and full score reports

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[github-actions]

This issue is stale because it has been open 30 days with no activity.

[corwintines]

Thanks @donatik27

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