docs(lynx): remove unsupported feature flags from documentation

[junghyeonsu]

Summary

• enableFlexBasisZeroPercent와 enableTransformedTouchPosition을 feature-flags 문서와 installation 문서에서 제거
• 두 옵션 모두 @lynx-js/type-config@3.6.0의 CompilerOptions/Config 타입에 정의되어 있지 않아 pluginLynxConfig 사용 시 TypeScript 에러 발생

Test plan

• feature-flags.mdx 문서 구조가 자연스러운지 확인 (빈 섹션 없음)
• installation.mdx 코드 블록이 유효한 TypeScript인지 확인
• 문서 사이트 빌드 정상 동작 확인

🤖 Generated with Claude Code

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