Merge pull request 'Supporting new opam-graph scoping of CSS' (#97) from 20220315_supporting_new_opam-graph_scoping_of_CSS into main

Reviewed-on: https://git.robur.io/robur/builder-web/pulls/97

bin/visualizations/builder_viz.ml

@@ -78,7 +78,7 @@ let print_dependencies_html file =
   let transitive = false in
   let graph = Ui.dependencies ~transitive data in
   let override_css = {|
-    .treemap-svg-wrap {
+    .deps-svg-wrap {
       background: rgb(60, 60, 87);
     }
   |}