Convert repository copy to English-only (remove Bulgarian/Cyrillic text)

[AlexKitipov]

Motivation

• Remove all Bulgarian/Cyrillic UI and content text so the portfolio presents a single English-language experience while preserving project structure and code logic.
• Make legacy static pages, React copy, and planning docs consistent and professional in English for public-facing presentation.

Description

• Replaced Bulgarian/Cyrillic labels, headings, body copy, and lang attributes in legacy HTML files at docs/legacy/index.html, about.html, contacts.html, and links.html with English equivalents and neutral placeholders where needed.
• Updated React-visible text only (no functional code or types) in src/components/* and src/pages/* such as Hero.tsx, AboutNarrative.tsx, FeaturedProjects.tsx, and AboutPage.tsx to remove Bulgarian fragments.
• Converted content data to English in src/data/* including biography.ts, algorithmOfTheDay.ts, projects.ts, and skills.ts, and adjusted planning text in DEVELOPMENT_PLAN.md to reference an English-first presentation.
• Kept project structure, file names, imports, hooks, and TypeScript types unchanged and ran code formatting with prettier to preserve repo style.

Testing

• Ran linting with npm run lint and type checking with npm run typecheck, both completed without errors.
• Executed unit/smoke tests with npm run test (9/9 tests passed) and built a production bundle with npm run build, both succeeded.
• Verified formatting with npx prettier --check and ensured there are no remaining Cyrillic characters using a repository-wide search (rg -n "[\p{Cyrillic}]"), both checks passed.
• Note: Playwright installation for screenshot capture failed due to an external npm registry 403, so no screenshot tooling was produced during this run.

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Codex Task