Fix Astro/Vercel Production Deployment Issues for Static Assets

Summary

Resolved production 500 errors on Vercel by fixing undated/nonexistent icons in the @tabler library as well as conflicting folders assets/Icons and assets/icons. Also removed legacy callouts code that is no longer in use.

Why Care

Without fixing the asset management system, Astro builds worked locally but crashed with Internal Server Errors on Vercel. Correcting the public asset handling ensures production stability and faster page load times without serverless crashes.

Implementation

Changes Made

Added old @tabler icons to src/assets/icons
Removed 5+ remark callouts files that are not doing anything