Inheritance graphs in SVG readability improvements

### Describe the issue:

Inheritance graphs in SVG can be confusing to read for large codebases. This can be mitigated with the following ideas:

* Remove Mock contracts from the graph: they are usually not audited directly
* Remove the private error node, which can be very large (and it is always disconnected from the rest?)
* Avoid using colors like yellow, which are difficulty to read when using white background.
* Optionally, allow to hide the interface contracts, to quickly identify where the code is defined

### Code example to reproduce the issue:

We already have this internally.

### Version:

Slither 0.8.3

### Relevant log output:

_No response_