Improve images, add asyn directory.

README.md

@@ -103,10 +103,7 @@ Sample fonts created by [font_to_py.py](https://github.com/peterhinch/micropytho
  * `font6.py`
  * `freesans20.py`
 
-Demo of the use of `nanogui` with `uasyncio`:  
- * `asnano.py` Runs until the usr button is pressed.
-
-Requires [asyn.py](https://github.com/peterhinch/micropython-async/blob/master/asyn.py).
+Demos showing the use of `nanogui` with `uasyncio` may be found [here](./async/ASYNC.md).
 
 ## 2.2 Dependencies
 

plot/FPLOT.md

@@ -10,8 +10,7 @@ This was ported from the
 Like `nanogui.py` it uses synchronous code.
 
 Please excuse the photography: these displays look **much** better than in my
-pictures. The effect at the top left corner is an artifact of my efforts at
-post processing.
+pictures.
 
 ![Image](images/cartesian.png) Classic Cartesian plot.