remove useless package.json file for open-sans, causing irrelevant security alert

admin/themes/default/fonts/open-sans/package.json

@@ -1,55 +0,0 @@
-{
-  "name": "open-sans-fontface",
-  "version": "1.4.2",
-  "main": "./open-sans.css",
-  "homepage": "https://github.com/FontFaceKit/open-sans",
-  "authors": [
-    "Gustavo Henke <gustavo@injoin.com.br>",
-    "Martin Domke <martin.domke@gateprotect.com>",
-    "Bernhard Döbler <programmer@bardware.de>"
-  ],
-  "description": "The Open Sans fontface",
-  "keywords": [
-    "font"
-  ],
-  "scripts": {
-    "prettysass": "prettier --write --print-width 120 --tab-width 4 --use-tabs sass/*.scss",
-    "sass": "node-sass --output-style expanded --precision 6 open-sans.scss open-sans.expanded.css",
-    "sass_autoprefixer": "postcss open-sans.expanded.css -u autoprefixer -o open-sans.prefixed.css --no-map",
-    "sass_minify": "cleancss --level 1 --output open-sans.css open-sans.prefixed.css"
-  },
-  "repository": {
-    "type": "git",
-    "url": "https://github.com/FontFaceKit/open-sans"
-  },
-  "license": "Apache-2.0",
-  "ignore": [
-    "**/.*",
-    "node_modules",
-    "bower_components",
-    "test",
-    "tests"
-  ],
-  "bugs": {
-    "url": "https://github.com/FontFaceKit/open-sans/issues"
-  },
-  "devDependencies": {
-    "autoprefixer": "^9.1.1",
-    "clean-css-cli": "^4.2.1",
-    "eslint": "^5.3.0",
-    "eslint-config-prettier": "^3.0.1",
-    "eslint-plugin-prettier": "^2.6.2",
-    "node-sass": "^4.9.3",
-    "postcss-cli": "^6.0.0",
-    "prettier": "^1.14.2",
-    "prettier-eslint": "^8.8.2"
-  },
-  "browserslist": [
-    "> 1%",
-    "last 1 version",
-    "not dead",
-    "IE 10",
-    "Firefox ESR"
-  ],
-  "dependencies": {}
-}