Remove unused dependencies (#1343)

Removes d3, acorn, ajv and clean-css from
package.json since they're not direcly used by Fauxton
diff --git a/package-lock.json b/package-lock.json
index e37ba63..123bd28 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -5372,7 +5372,8 @@
     "acorn": {
       "version": "6.4.2",
       "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.4.2.tgz",
-      "integrity": "sha512-XtGIhXwF8YM8bJhGxG5kXgjkEuNGLTkoYqVE+KMR+aspr4KGYmKYg7yUe3KghyQ9yheNwLnjmzh/7+gfDBmHCQ=="
+      "integrity": "sha512-XtGIhXwF8YM8bJhGxG5kXgjkEuNGLTkoYqVE+KMR+aspr4KGYmKYg7yUe3KghyQ9yheNwLnjmzh/7+gfDBmHCQ==",
+      "dev": true
     },
     "acorn-globals": {
       "version": "6.0.0",
@@ -6972,6 +6973,7 @@
       "version": "4.2.4",
       "resolved": "https://registry.npmjs.org/clean-css/-/clean-css-4.2.4.tgz",
       "integrity": "sha512-EJUDT7nDVFDvaQgAo2G/PJvxmp1o/c6iXLbswsBbUFXi1Nr+AjA2cKmfbKDMjMvzEe75g3P6JkaDDAKk96A85A==",
+      "dev": true,
       "requires": {
         "source-map": "~0.6.0"
       }
@@ -7459,11 +7461,6 @@
       "integrity": "sha1-WW6WmP0MgOEgOMK4LW6xs1tiJNk=",
       "dev": true
     },
-    "d3": {
-      "version": "3.5.17",
-      "resolved": "https://registry.npmjs.org/d3/-/d3-3.5.17.tgz",
-      "integrity": "sha1-vEZ0gAQ3iyGjYMn8fPUjF5B2L7g="
-    },
     "dashdash": {
       "version": "1.14.1",
       "resolved": "https://registry.npmjs.org/dashdash/-/dashdash-1.14.1.tgz",
@@ -19863,7 +19860,8 @@
     "source-map": {
       "version": "0.6.1",
       "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
-      "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g=="
+      "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==",
+      "dev": true
     },
     "source-map-resolve": {
       "version": "0.5.3",
diff --git a/package.json b/package.json
index 35f5011..9f4896f 100644
--- a/package.json
+++ b/package.json
@@ -61,19 +61,15 @@
   },
   "dependencies": {
     "@webcomponents/url": "^0.7.8",
-    "acorn": "^6.4.2",
-    "ajv": "^6.12.6",
     "async": "~0.2.6",
     "backbone": "^1.4.0",
     "base-64": "^1.0.0",
     "bluebird": "^3.7.2",
     "brace": "^0.11.0",
     "classnames": "^2.2.6",
-    "clean-css": "^4.2.4",
     "clipboard": "^2.0.8",
     "cookie": "^0.3.1",
     "core-js": "^2.6.11",
-    "d3": "^3.4.11",
     "express": "^4.17.2",
     "http-proxy": "^1.18.1",
     "jquery": "^3.5.1",