Move the directive documentation into its own underlay, separate from basewiki, since it's sorta large compared to the rest of basewiki.

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+The `tag` and `taglink` directives are supplied by the [[!iki plugins/tag]] plugin.
+
+These directives allow tagging pages. List tags as follows:
+
+	\[[!tag tech life linux]]
+
+The tags work the same as if you had put a (hidden) [[ikiwiki/WikiLink]] on
+the page for each tag, so you can use a [[ikiwiki/PageSpec]] match all
+pages that are tagged with a given tag, for example. The tags will also
+show up on blog entries and at the bottom of the tagged pages, as well as
+in RSS and Atom feeds.
+
+If you want a visible [[ikiwiki/WikiLink]] along with the tag, use taglink
+instead:
+
+	\[[!taglink foo]]
+	\[[!taglink tagged_as_foo|foo]]
+
+Note that if the wiki is configured to use a tagbase, then the tags will be
+located under a base directory, such as "tags/". This is a useful way to
+avoid having to write the full path to tags, if you want to keep them
+grouped together out of the way.
+
+If you want to override the tagbase for a particular tag, you can use
+something like this:
+
+	\[[!tag ./foo]]
+	\[[!taglink /foo]]
+
+[[!meta robots="noindex, follow"]]