graphviz filter commands: add pages (#6401)

pages/common/mingle.md

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+# mingle
+
+> Bundle the edges of a graph layout.
+> Graphviz filters: `acyclic`, `bcomps`, `comps`, `edgepaint`, `gvcolor`, `gvpack`, `mingle`, `nop`, `sccmap`, `tred`, & `unflatten`.
+> More information: <https://www.graphviz.org/pdf/mingle.1.pdf>.
+
+- Bundle the edges of one or more graph layouts (that already have layout information):
+
+`mingle {{path/to/layout1.gv}} {{path/to/layout2.gv ...}} > {{path/to/output.gv}}`
+
+- Perform layout, bundling, and output to a picture with one command:
+
+`dot {{path/to/input.gv}} | mingle | dot -T {{png}} > {{path/to/output.png}}`
+
+- Display help for `mingle`:
+
+`mingle -?`