Remove Webpack and replace with more native tooling (JS, SCSS, TypeScript)

[sebastianthulin]

We should remove Webpack as our build tool and replace it with a more modern, native tooling setup.
The goal is to simplify our build process, improve performance, and reduce dependency bloat.

The new setup should support:

• JavaScript (ES modules, transpilation where needed)
• TypeScript (type checking + compilation)
• SCSS (compilation to CSS, autoprefixing, minification)
• Other present languages and solutions.

Motivation

• Webpack is heavier than needed for our current setup.
• Native tools offer faster builds, easier configuration, and better ESM support.
• Fewer dependencies → faster CI/CD.

Acceptance Criteria

• Webpack is fully removed from the project.
• New build pipeline implemented using modern tooling.
• JS, TS, and SCSS files are built and optimized for production.
• Development server with hot-reload support is available.
• CI/CD updated to work with the new build process.
• Documentation updated to reflect the new tooling and commands.
• Cashbusting logic (manifest.json) is still present and works the same way.

Notes

• Ensure backward compatibility with existing import paths.
• Keep build output structure consistent to avoid breaking deployment scripts.