Document this oddball plugin.

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+[[!template id=plugin name=dynamiccookies author="[[schmonz]]"]]
+[[!template id=gitbranch branch=schmonz/dynamiccookies author="[[schmonz]]"]]
+[[!tag type/web]]
+
+This plugin populates ikiwiki's cookiejar by calling an external
+program. The program is expected to print the serialized cookies
+on `stdout` in a form which can be `eval`'d (e.g., `Data::Dumper`).
+
+The plugin author's use case for this seemingly hacky interface:
+aggregating authenticated feeds at work, where for various reasons
+the needed cookies must be acquired using a separate `perl` from
+the one used by ikiwiki.