duc: add page (#7869)

* Create duc.md

Co-authored-by: Emily Grace Seville <emilyseville7cf@gmail.com>

pages/common/duc.md

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+# duc
+
+> Duc is a collection of tools for indexing, inspecting and visualizing disk usage. Duc maintains a database of accumulated sizes of directories of the file system, allowing queries this database, or create fancy graphs to show where data is.
+> More information: <https://duc.zevv.nl/>.
+
+- Index the /usr directory, writing to the default database location ~/.duc.db:
+
+`duc index {{/usr}}`
+
+- List all files and directories under /usr/local, showing relative file sizes in a [g]raph:
+
+`duc ls -Fg {{/usr/local}}`
+
+- List all files and directories under /usr/local using treeview recursively:
+
+`duc ls -Fg -R {{/usr/local}}`
+
+- Start the graphical interface to explore the file system using sunburst graphs:
+
+`duc gui {{/usr}}`
+
+- Run the ncurses console interface to explore the file system:
+
+`duc ui {{/usr}}`
+
+- Dump database info:
+
+`duc info`

pages/linux/duc.md

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+# duc
+
+> Duc is a collection of tools for indexing, inspecting and visualizing disk usage. Duc maintains a database of accumulated sizes of directories of the file system, allowing queries this database, or create fancy graphs to show where data is.
+> More information: <https://duc.zevv.nl/>.
+
+- Index the /usr directory, writing to the default database location ~/.duc.db:
+
+`duc index {{/usr}}`
+
+- List all files and directories under /usr/local, showing relative file sizes in a [g]raph:
+
+`duc ls --classify --graph {{/usr/local}}`
+
+- List all files and directories under /usr/local using treeview recursively:
+
+`duc ls --classify --graph --recursive {{/usr/local}}`
+
+- Start the graphical interface to explore the file system using sunburst graphs:
+
+`duc gui {{/usr}}`
+
+- Run the ncurses console interface to explore the file system:
+
+`duc ui {{/usr}}`
+
+- Dump database info:
+
+`duc info`