update radar script

README.md

@@ -1,7 +1,13 @@
 # Data and Analytics Engineering Tech Radar
 
-Uses [generate-tech-radar](https://github.com/moj-analytical-services/generate-tech-radar) to visualise tech radar blips configured in `blips.json` against tech radar rings and quadrants configured in `radar_config.json`.
+In the MoJ [Data and Analytics Engineering community](https://ministryofjustice.github.io/data-and-analytics-engineering/), 
+we maintain a [public Tech Radar](http://zalando.github.io/tech-radar/) to help our teams
+align on technology choices. It is based on the [pioneering work
+by ThoughtWorks](https://www.thoughtworks.com/radar) and uses Zalando's 
+[`radar.js`](https://github.com/zalando/tech-radar/blob/master/docs/radar.js) [d3.js v4](https://d3js.org) visualisation.
 
-Saves and extracts tech radar blips to and from GitHub discussions.
+Tech radar blips are configured in `blips.json` against tech radar rings 
+and quadrants configured in `radar_config.json`. 
 
-Adapted from [Zalando's](http://zalando.github.io/tech-radar/) and [Thoughtworks](https://www.thoughtworks.com/en-gb/radar) technology radars.
+We use GitHub discussions to provide additional context to the blips, 
+and the GitHub graphql API to automate the population of `blips.json`.