Remove electron_app as we now have riot-desktop repo

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

package.json

@@ -1,7 +1,6 @@
 {
   "name": "riot-web",
   "productName": "Riot",
-  "main": "electron_app/src/electron-main.js",
   "version": "1.6.0",
   "description": "A feature-rich client for Matrix.org",
   "author": "New Vector Ltd.",
@@ -35,7 +34,7 @@
     "reskindex": "reskindex -h src/header",
     "reskindex:watch": "reskindex -h src/header -w",
     "reskindex:watch-react": "node scripts/yarn-sub.js matrix-react-sdk reskindex:watch",
-    "clean": "rimraf lib webapp electron_app/dist",
+    "clean": "rimraf lib webapp",
     "build": "yarn clean && yarn build:genfiles && yarn build:compile && yarn build:types && yarn build:bundle",
     "build-stats": "yarn clean && yarn build:genfiles && yarn build:compile && yarn build:types && yarn build:bundle-stats",
     "build:jitsi": "node scripts/build-jitsi.js",
@@ -45,17 +44,11 @@
     "build:compile": "babel -d lib --verbose --extensions \".ts,.js,.tsx\" src",
     "build:bundle": "cross-env NODE_ENV=production webpack -p --progress --bail --mode production",
     "build:bundle-stats": "cross-env NODE_ENV=production webpack -p --progress --bail --mode production --json > webpack-stats.json",
-    "build:electron": "yarn build && yarn install:electron && electron-builder -wml --ia32 --x64",
-    "build:electron:linux": "yarn build && electron-builder -l --x64",
-    "build:electron:macos": "yarn build && electron-builder -m --x64",
-    "build:electron:windows": "yarn build && electron-builder -w --ia32 --x64",
     "build:types": "tsc --emitDeclarationOnly --jsx react",
-    "install:electron": "electron-builder install-app-deps",
     "dist": "scripts/package.sh",
     "start": "concurrently --kill-others-on-fail --prefix \"{time} [{name}]\" -n reskindex,reskindex-react,res,riot-js \"yarn reskindex:watch\" \"yarn reskindex:watch-react\" \"yarn start:res\" \"yarn start:js\"",
     "start:res": "yarn build:jitsi && node scripts/copy-res.js -w",
     "start:js": "webpack-dev-server --host=0.0.0.0 --output-filename=bundles/_dev_/[name].js --output-chunk-filename=bundles/_dev_/[name].js -w --progress --mode development",
-    "electron": "yarn build && yarn install:electron && electron .",
     "lint": "yarn lint:types && yarn lint:ts && yarn lint:js && yarn lint:style",
     "lint:js": "eslint src",
     "lint:ts": "echo 'We don't actually have a typescript linter at this layer because tslint is being removed from our stack. Presumably your TS is fine.'",
@@ -109,10 +102,6 @@
     "cpx": "^1.3.2",
     "cross-env": "^6.0.3",
     "css-loader": "^3.3.2",
-    "electron-builder": "^22.3.2",
-    "electron-builder-squirrel-windows": "^22.3.2",
-    "electron-devtools-installer": "^2.2.4",
-    "electron-notarize": "^0.2.0",
     "eslint": "^5.8.0",
     "eslint-config-google": "^0.7.1",
     "eslint-plugin-babel": "^4.1.2",
@@ -156,57 +145,7 @@
     "webpack-cli": "^3.3.10",
     "webpack-dev-server": "^3.9.0"
   },
-  "build": {
-    "appId": "im.riot.app",
-    "electronVersion": "7.1.14",
-    "files": [
-      "node_modules/**",
-      "src/**"
-    ],
-    "extraResources": [
-      {
-        "from": "electron_app/img",
-        "to": "img"
-      },
-      "webapp/**/*"
-    ],
-    "linux": {
-      "target": "deb",
-      "category": "Network;InstantMessaging;Chat",
-      "maintainer": "support@riot.im",
-      "desktop": {
-        "StartupWMClass": "riot"
-      }
-    },
-    "mac": {
-      "category": "public.app-category.social-networking",
-      "darkModeSupport": true
-    },
-    "win": {
-      "target": {
-        "target": "squirrel"
-      },
-      "sign": "scripts/electron_winSign"
-    },
-    "directories": {
-      "buildResources": "electron_app/build",
-      "output": "electron_app/dist",
-      "app": "electron_app"
-    },
-    "afterSign": "scripts/electron_afterSign.js",
-    "protocols": [
-      {
-        "name": "riot",
-        "schemes": [
-          "riot"
-        ]
-      }
-    ]
-  },
   "jest": {
-    "modulePathIgnorePatterns": [
-      "<rootDir>/electron_app"
-    ],
     "testEnvironment": "jest-environment-jsdom-fourteen",
     "testMatch": [
       "<rootDir>/test/**/*-test.js"