dconf, dconf-write: add page (#5967)

pages/linux/dconf-write.md

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+# dconf write
+
+> Write a value to a dconf database path.
+> More information: <https://developer.gnome.org/dconf>.
+
+- Write a string to a dconf path (note the nested quotes):
+
+`dconf write {{/example/dconf/path}} "'{{Example Value}}'"`
+
+- Write a boolean to a dconf path:
+
+`dconf write {{/example/dconf/path}} {{true|false}}`
+
+- Write an integer to a dconf path:
+
+`dconf write {{/example/dconf/path}} {{16}}`
+
+- Write an array to a dconf path:
+
+`dconf write {{/example/dconf/path}} "[{{'My First Value', 'My Second Value'}}]"`
+
+- Write an empty array to a dconf path:
+
+`dconf write {{/example/dconf/path}} "@as []"`

pages/linux/dconf.md

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+# dconf
+
+> Simple tool for manipulating dconf databases.
+> See also `dconf write`.
+> More information: <https://developer.gnome.org/dconf>.
+
+- Print the value of a dconf path:
+
+`dconf read {{/example/dconf/path}}`
+
+- List contents of a dconf path:
+
+`dconf list {{/example/dconf/path}}`
+
+- Watch for dconf database changes in a path and subpaths:
+
+`dconf watch {{/example/dconf/path}}`