Add 'nix store optimise' manpage

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+R""(
+
+# Examples
+
+* Optimise the Nix store:
+
+  ```console
+  nix store optimise
+  ```
+
+# Description
+
+This command deduplicates the Nix store: it scans the store for
+regular files with identical contents, and replaces them with hard
+links to a single instance.
+
+Note that you can also set `auto-optimise-store` to `true` in
+`nix.conf` to perform this optimisation incrementally whenever a new
+path is added to the Nix store. To make this efficient, Nix maintains
+a content-addressed index of all the files in the Nix store in the
+directory `/nix/store/.links/`.
+
+)""