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 `img` directive is supplied by the [[!iki plugins/img]] plugin.
+
+This is an image handling directive.  While ikiwiki supports inlining full-size
+images by making a [[ikiwiki/WikiLink]] that points to the image, using
+this directive you can easily scale down an image for inclusion onto a page,
+providing a link to a full-size version.
+
+## usage
+
+	\[[!img image1.jpg size="200x200" alt="clouds"]]
+
+The image file will be searched for using the same rules as used to find
+the file pointed to by a [[ikiwiki/WikiLink]].
+
+The `size` parameter is optional, defaulting to full size. Note that the
+original image's aspect ratio is always preserved, even if this means
+making the image smaller than the specified size. You can also specify only
+the width or the height, and the other value will be calculated based on
+it: "200x", "x200"
+
+You can also pass `alt`, `title`, `class` and `id` parameters. These are
+passed through unchanged to the html img tag. If you include a `caption`
+parameter, the caption will be displayed centered beneath the image.
+
+The `link` parameter is used to control whether the scaled down image links
+to the full size version. By default it does; set "link=somepage" to link
+to another page instead, or "link=no" to disable the link, or
+"link=http://url" to link to a given url.
+
+You can also set default values that will be applied to all later images on
+the page, unless overridden. Useful when including many images on a page.
+
+	\[[!img defaults size=200x200 alt="wedding photo"]]
+	\[[!img photo1.jpg]]
+	\[[!img photo2.jpg]]
+	\[[!img photo3.jpg size=200x600]]
+
+[[!meta robots="noindex, follow"]]