website: upgrade Docusaurus version

website/package.json

@@ -10,8 +10,8 @@
     "deploy": "docusaurus deploy"
   },
   "dependencies": {
-    "@docusaurus/core": "^2.0.0-alpha.31",
-    "@docusaurus/preset-classic": "^2.0.0-alpha.31",
+    "@docusaurus/core": "^2.0.0-alpha.40",
+    "@docusaurus/preset-classic": "^2.0.0-alpha.40",
     "classnames": "^2.2.6",
     "react": "^16.8.4",
     "react-dom": "^16.8.4"

website/src/css/custom.css

@@ -6,4 +6,7 @@
   --ifm-color-primary-light: rgb(146, 146, 242);
   --ifm-color-primary-lighter: rgb(165, 165, 245);
   --ifm-color-primary-lightest: rgb(191, 191, 248);
+
+  --ifm-font-size-base: 16px;
+  --ifm-code-font-size: 0.8rem;
 }