restore inline images

<div> seems to be messing with the ability of the plain-old markdown processor to display inline images. Slightly degrades appearance of gh-pages.

docs/features/OUTPAINTING.md

@@ -64,9 +64,7 @@ model](INPAINTING.md#using-the-runwayml-inpainting-model).
 
 Consider this image:
 
-<div align="center" markdown>
 ![curly_woman](../assets/outpainting/curly.png)
-</div>
 
 Pretty nice, but it's annoying that the top of her head is cut
 off. She's also a bit off center. Let's fix that!
@@ -103,3 +101,40 @@ you'll get a slightly different result. You can run it repeatedly
 until you get an image you like. Unfortunately `!fix` does not
 currently respect the `-n` (`--iterations`) argument.
 
+## Outpaint
+
+The `outpaint` extension does the same thing, but with subtle
+differences. Starting with the same image, here is how we would add an
+additional 64 pixels to the top of the image:
+
+```bash
+invoke> !fix images/curly.png --out_direction top 64
+```
+
+(you can abbreviate `--out_direction` as `-D`.
+
+The result is shown here:
+
+![curly_woman_outpaint](../assets/outpainting/curly-outpaint.png)
+
+Although the effect is similar, there are significant differences from
+outcropping:
+
+- You can only specify one direction to extend at a time.
+- The image is **not** resized. Instead, the image is shifted by the specified
+number of pixels. If you look carefully, you'll see that less of the lady's
+torso is visible in the image.
+- Because the image dimensions remain the same, there's no rounding
+to multiples of 64.
+- Attempting to outpaint larger areas will frequently give rise to ugly
+   ghosting effects.
+- For best results, try increasing the step number.
+- If you don't specify a pixel value in `-D`, it will default to half
+   of the whole image, which is likely not what you want.
+
+!!! tip
+
+    Neither `outpaint` nor `outcrop` are perfect, but we continue to tune
+    and improve them. If one doesn't work, try the other. You may also
+    wish to experiment with other `img2img` arguments, such as `-C`, `-f`
+    and `-s`.