fix(docs): remove contextless diagram from visualization/10min.rst

The arbitrary a->b->c->d diagram with unexplained coloring was
misleading. Other diagrams use type labels and filter semantics
to justify their coloring - this one had none.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: lmeyerov

docs/source/visualization/10min.rst

@@ -125,14 +125,6 @@ When you need a quick static image without an interactive client, render directl
    svg = g.plot_static(format='svg', max_nodes=200, max_edges=400)
    SVG(svg)
 
-.. graphviz::
-
-   digraph viz_static_demo {
-      rankdir=LR;
-      a -> b -> c -> d;
-      a [shape=box, style=filled, fillcolor=lightyellow];
-   }
-
 Text-only outputs
 -----------------