The intranet header workspace package can be removed for v9 and up. With it, also all documentation and references in other places should be removed.
### Tasks
- [ ] Alternative header needs to exist
- [ ] Remove the intranet-header workspace package and all it's subfolders from the repo
- [ ] Mark the @swisspost/design-system-intranet-header package as deprecated on npm with a reference to the new header that can be built with the components package
- [ ] Remove any mentions of the intranet header from documentation or contribution/security instructions
- [ ] Check for references to the intranet header on confluence and mark them as deprecated, update any URLs to https://archive.design-system.post.ch
The intranet header workspace package can be removed for v9 and up. With it, also all documentation and references in other places should be removed.