[figures] recreate neopixel timing

docs/figures/license.md

@@ -3,9 +3,6 @@
 Figures are own work if not otherwise stated; see the [project's license](https://github.com/stnolting/neorv32/blob/main/LICENSE).
 No copyright infringement intended.
 
-- `neopixel.png`
-  - source: Adafruit NeoPixel Überguide, https://learn.adafruit.com/adafruit-neopixel-uberguide/the-magic-of-neopixels
-
 - `SPI_timing_diagram2.wikimedia.png`
   - source: https://en.wikipedia.org/wiki/File:SPI_timing_diagram2.svg
   - license: Creative Commons: https://en.wikipedia.org/wiki/Creative_Commons, Attribution-Share Alike 3.0 Unported: https://creativecommons.org/licenses/by-sa/3.0/deed.en

docs/sources/neopixel_timing.json

@@ -0,0 +1,7 @@
+{signal: [
+  {name: '0-code', wave: '01...0...1',  node: '.a...b...c' },
+  {name: '1-code', wave: '01....0..1',  node: '.d....e..f' },
+  {name: 'reset',  wave: '10.......1',  node: '.g.......h' },
+],
+ edge: ['a~>b T0H', 'b~>c T0L', 'd~>e T1H', 'e~>f T1L', 'g~>h TRESET']
+}