graphviz filter commands: add pages (#6401)

pages/common/edgepaint.md

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+# edgepaint
+
+> Colorize edges of a graph layout to clarify crossing edges.
+> Graphviz filters: `acyclic`, `bcomps`, `comps`, `edgepaint`, `gvcolor`, `gvpack`, `mingle`, `nop`, `sccmap`, `tred`, & `unflatten`.
+> More information: <https://graphviz.org/pdf/edgepaint.1.pdf>.
+
+- Colorize edges of one or more graph layouts (that already have layout information) to clarify crossing edges:
+
+`edgepaint {{path/to/layout1.gv}} {{path/to/layout2.gv ...}} > {{path/to/output.gv}}`
+
+- Colorize edges using a color scheme. (See <https://graphviz.org/doc/info/colors.html#brewer>):
+
+`edgepaint -color-scheme={{accent7}} {{path/to/layout.gv}} > {{path/to/output.gv}}`
+
+- Lay out a graph and colorize its edges, then convert to a PNG image:
+
+`dot {{path/to/input.gv}} | edgepaint | dot -T {{png}} > {{path/to/output.png}}`
+
+- Display help for `edgepaint`:
+
+`edgepaint -?`