got it working again

weirdly enough yarn stopped installing all the correct bin files.
I was missing the javascript file that hooked the app into the page, 
etc.

package.json

@@ -3,13 +3,13 @@
   "version": "1.0.0",
   "devDependencies": {
     "npm-run-all": "^4.1.5",
-    "rollup": "^1.10.1",
-    "rollup-plugin-commonjs": "^9.3.4",
+    "rollup": "^1.12.1",
+    "rollup-plugin-commonjs": "^10.0.0",
     "rollup-plugin-livereload": "^1.0.0",
-    "rollup-plugin-node-resolve": "^4.2.3",
+    "rollup-plugin-node-resolve": "^5.2.0",
     "rollup-plugin-svelte": "^5.0.3",
     "rollup-plugin-terser": "^4.0.4",
-    "sirv-cli": "^0.4.0",
+    "sirv-cli": "^0.4.4",
     "svelte": "^3.0.0"
   },
   "scripts": {