pacgraph: add page (#13499)

* pacgraph: add page

---------

Co-authored-by: spageektti <git@spageektti.cc>
Co-authored-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>

pages/linux/pacgraph.md

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+# pacgraph
+
+> Draw a graph of installed packages to PNG/SVG/GUI/console.
+> More information: <https://github.com/keenerd/pacgraph>.
+
+- Produce an SVG and PNG graph:
+
+`pacgraph`
+
+- Produce an SVG graph:
+
+`pacgraph --svg`
+
+- Print summary to console:
+
+`pacgraph --console`
+
+- Override the default filename/location (Note: Do not specify the file extension):
+
+`pacgraph --file={{path/to/file}}`
+
+- Change the color of packages that are not dependencies:
+
+`pacgraph --top={{color}}`
+
+- Change the color of package dependencies:
+
+`pacgraph --dep={{color}}`
+
+- Change the background color of a graph:
+
+`pacgraph --background={{color}}`
+
+- Change the color of links between packages:
+
+`pacgraph --link={{color}}`