handwired/trackpoint: readme cleanup

- fix wiring layout image URL
- update readme structure

keyboards/handwired/trackpoint/README.md

@@ -2,9 +2,18 @@
 
 This is just a simple demo to show how to integrate IBM Trackpoint in QMK.
 
-Wiring used in the demonstration:
-![Wiring example](http://imgur.com/8ghG2U8)
+Wiring used in the demonstration:  
+![Wiring example](https://i.imgur.com/8ghG2U8.png)
 
 Some documentation:
-* [How to wire IBM Trackpoint](https://github.com/alonswartz/trackpoint)
-* [QMK documentation](https://docs.qmk.fm/)
+
+- [How to wire IBM Trackpoint](https://github.com/alonswartz/trackpoint)
+
+Keyboard Maintainer: [The QMK Community](https://github.com/qmk)  
+Hardware Supported: Teensy  
+
+Make example for this keyboard (after setting up your build environment):
+
+    make handwired/trackpoint:default
+
+See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).