chore: adapted those URLs to the pattern lab monorepo (#1395)

Author: mfranzke

packages/starterkit-twig-demo/composer.json

@@ -19,9 +19,9 @@
     }
   ],
   "support": {
-    "issues":         "https://github.com/pattern-lab/starterkit-twig-demo/issues",
+    "issues":         "https://github.com/pattern-lab/patternlab-node/issues",
     "wiki":           "https://patternlab.io/docs/",
-    "source":         "https://github.com/pattern-lab/starterkit-twig-demo/releases"
+    "source":         "https://github.com/pattern-lab/patternlab-node/releases"
   },
   "require": {
     "pattern-lab/core": "^2.0.0",