Simplify Mermaid diagram markup in README

Author: matejchalk

README.md

@@ -28,12 +28,6 @@ Some configs extend other configs, as illustrated below. So, for example, extend
 
 ```mermaid
   graph BT;
-    javascript("javascript")
-    typescript("typescript")
-    node("node")
-    angular("angular")
-    ngrx("ngrx")
-    graphql("graphql")
     typescript --extends--> javascript
     node --extends--> javascript
     angular --extends--> typescript

scripts/helpers/format-readme.js

@@ -126,7 +126,9 @@ function iconToImage(icon) {
 function mermaidDiagram(nodes, edges, orientation = 'TD') {
   return [
     `  graph ${orientation};`,
-    ...nodes.map(node => `    ${node.id}("${node.label}")`),
+    ...nodes
+      .filter(node => node.id !== node.label)
+      .map(node => `    ${node.id}("${node.label}")`),
     ...edges.map(
       edge =>
         '    ' +