- Use type 'no-value' as fallback value
- Send info also for state variables with type 'no-value'

- remove superfluous package @cortex-js/compute-engine

- add packge cortex: needes for math-live

- Uses katex library
- TipTap extension similar to Cloze child elements. Only the rendering 
is different and done directly within the TipTap extension.

#647

#656

This fixes a bug with cy.contains.

- A suitable version was not available after update of Angular
- Reactivate test for valid pages

with ng update @angular/material@16 @angular/cdk@16
- run npm audit fix

- run npm audit fix to fix some critical vulnerables