[Bug]: CI docs warning: switch from material to zensical

### Search before creating an issue

- [x] I have searched existing issues and confirmed this is not a duplicate

### Bug Description

We have the following warning in the CI:

```bash
│ ⚠ WARNING – MkDocs 2.0 is incompatible with Material for MkDocs
 │ 
 │  MkDocs 1.x is unmaintained. We recommend switching to Zensical, our
 │  new static site generator, as soon as possible. We're providing an
 │  analysis of the situation in this article:
 │ 
 │  https://squidfunk.github.io/mkdocs-material/blog/2026/02/18/mkdocs-2.0/
```

### Steps to Reproduce

1. Go to any PR
2. Check the CI docs

### Expected Behavior

No warning

### Actual Behavior

Warnings

### Environment

_No response_

### Relevant Log Output

```shell

```

### Additional Context

We need to move from material to zensical following their documentation that you can find in the logs.

**Definition of Done**
- [ ] no warning anymore
- [ ] use zensical