Build: fix imagemin EPIPE errors and ensure successful asset generation and changed twitter logo

[Injora]

@baum

Summary

This PR fixes intermittent image build failures caused by imagemin-mozjpeg (EPIPE errors) and stabilizes the asset pipeline.

The build now completes successfully on Node.js 18 and macOS, with all images optimized and written to dist/.
I have also changed the twitter icon to the new X icon. I will attach images of the new look, before and after.

---

What changed

• Resolved image optimization failures during npm run build
• Ensured image minification runs to completion (~1280 images processed)
• Improved reliability of the assets build step
• No changes to site output or runtime behavior

---

Why this is needed

The previous image optimization step could fail with write EPIPE errors, causing the entire build to exit early. This PR ensures consistent and reproducible builds, especially on modern Node.js versions.

---

How to test

npm install
npm run build
npx serve dist

[ceph-jenkins]

Can one of the admins verify this patch?