dot: add page (#1578)

pages/common/dot.md

@@ -0,0 +1,11 @@
+# dot
+
+> A command-line tool to produce layered drawings of directed graphs.
+
+- Render an image file and determine output filename based on input filename and selected format:
+
+`dot -Tpng -O {{path/to/file.dot}}`
+
+- Create an SVG from DOT file:
+
+`dot -Tsvg -o{{path/to/out_file.svg}} {{path/to/file.dot}}`