fix: remove unnecessary document injection

## Problem The problem involves a TypeError caused by unnecessary document injection, leading to prerendering errors during Next.js operations. Closes #97 ## Solution **Bug Fixes**: - Removed the redundant document injection code that was causing prerendering errors. ## Tests - Verify PDF to Markdown conversion runs without errors in development (next dev) and production build (build) environments. - Test prerendering with a variety of PDFs to ensure consistent outcomes. ## Deploy Notes remove unnecessary document injection