Is your feature request related to a problem? Please describe.
The current output of --dag and --rulegraph is incompatible with mermaid JS diagram rendering.

Describe the solution you'd like
An option to have the --dag or --rulegraph output in mermaid JS formatting.

This format is widely supported across various platforms, including Jupyter notebooks, note-taking apps like Obsidian and Notion, and platforms such as GitHub and GitLab. See the integration section of Mermaid JS for more details.

Describe alternatives you've considered
Alternatives are to keep using snakemake --forceall --dag | dot -Tpdf > dag.pdf But this lacks the wide integration support of mermaid diagrams.

Additional context
Example of mermaid JS diagramming:

graph TD;
    A-->B;
    A-->C;
    B-->D;
    C-->D;