Start using system node libs, don't add yarn to package.json

debian/patches/0420-use-system-node-libs.patch

@@ -0,0 +1,15 @@
+--- a/package.json
++++ b/package.json
+@@ -15,12 +15,6 @@
+   "dependencies": {
+     "autosize": "^4.0.0",
+     "axios": "^0.17.1",
+-    "babel-core": "^6.26.0",
+-    "babel-eslint": "^8.0.2",
+-    "babel-loader": "^7.1.2",
+-    "babel-plugin-transform-define": "^1.3.0",
+-    "babel-preset-latest": "^6.24.1",
+-    "babel-preset-stage-2": "^6.24.1",
+     "blackst0ne-mermaid": "^7.1.0-fixed",
+     "bootstrap-sass": "^3.3.6",
+     "brace-expansion": "^1.1.8",

debian/patches/0430-use-yarn.patch

@@ -1,11 +0,0 @@
---- a/package.json
-+++ b/package.json
-@@ -13,6 +13,8 @@
-     "webpack-prod": "NODE_ENV=production webpack --config config/webpack.config.js"
-   },
-   "dependencies": {
-+    "yarn": "^1.5.1",
-+    "ajv-keywords": "2.1.1",
-     "autosize": "^4.0.0",
-     "axios": "^0.17.1",
-     "babel-core": "^6.26.0",

debian/patches/series

@@ -22,7 +22,7 @@ pid-log-paths.patch
 0392-relax-flipper.patch
 0410-set-webpack-root.patch
 0415-remove-dev-dependencies.patch
-0430-use-yarn.patch
+0420-use-system-node-libs.patch
 890757.patch
 add-system-lib-path-for-webpack.patch
 remove-bundle-analyzer.patch