Upgrade doc core version and fix image css issue

Author: LZoog

package.json

@@ -12,8 +12,8 @@
     "clear": "docusaurus clear"
   },
   "dependencies": {
-    "@docusaurus/core": "2.0.0-alpha.71",
-    "@docusaurus/preset-classic": "2.0.0-alpha.71",
+    "@docusaurus/core": "^2.0.0-alpha.72",
+    "@docusaurus/preset-classic": "^2.0.0-alpha.72",
     "@mdx-js/react": "^1.6.21",
     "clsx": "^1.1.1",
     "react": "^16.8.4",

src/css/custom.css

@@ -35,19 +35,19 @@
   height: 24px;
   display: flex;
   background-repeat: no-repeat;
-  background-image: url("/experimenter-docs/img/github.svg");
+  background-image: url("/img/github.svg");
 }
 
 [data-theme="dark"] .header-github-link::before {
-  background-image: url("/experimenter-docs/img/github-dark.svg");
+  background-image: url("/img/github-dark.svg");
 }
 
 .menu__list a[href^="http://"]:not([href*="localhost:3000"]):after,
 .menu__list a[href^="https://"]:not([href*="mozilla.github.io/experimenter-docs"]):after
 {
   content: "";
   background-repeat: no-repeat;
-  background-image: url("/experimenter-docs/img/external.svg");
+  background-image: url("/img/external.svg");
   display: block;
   min-width: 15px;
   height: 15px;