update Docusaurus to latest beta, fix Algolia styles (facebook#2636)

website/package.json

@@ -41,13 +41,14 @@
     ]
   },
   "dependencies": {
-    "@docusaurus/core": "2.0.0-alpha.75",
-    "@docusaurus/plugin-pwa": "2.0.0-alpha.75",
-    "@docusaurus/preset-classic": "2.0.0-alpha.75",
-    "docusaurus-plugin-sass": "^0.1.12",
+    "@docusaurus/core": "^2.0.0-beta.0",
+    "@docusaurus/plugin-pwa": "^2.0.0-beta.0",
+    "@docusaurus/preset-classic": "^2.0.0-beta.0",
+    "docusaurus-plugin-sass": "^0.2.0",
     "react": "^17.0.2",
     "react-dom": "^17.0.2",
-    "react-github-btn": "^1.2.0"
+    "react-github-btn": "^1.2.0",
+    "sass": "^1.34.0"
   },
   "devDependencies": {
     "alex": "^9.1.0",

website/src/css/customTheme.scss

@@ -46,13 +46,16 @@ html[data-theme="dark"] {
   --ifm-toc-border-color: var(--dark);
   --ifm-color-emphasis-300: var(--dark);
   --ifm-hr-border-color: var(--dark);
-  --docsearch-searchbox-background: var(--ifm-background-color);
-  --docsearch-modal-background: var(--deepdark);
-  --docsearch-footer-background: var(--dark);
-  --docsearch-key-gradient: var(--deepdark);
-  --docsearch-key-shadow: inset 0 -2px 0 0 var(--light),
+
+  *[class^="DocSearch"] {
+    --docsearch-searchbox-background: var(--ifm-background-color);
+    --docsearch-modal-background: var(--deepdark);
+    --docsearch-footer-background: var(--dark);
+    --docsearch-key-gradient: var(--deepdark);
+    --docsearch-key-shadow: inset 0 -2px 0 0 var(--light),
     inset 0 0 1px 1px var(--light), 0 1px 2px 1px var(--ifm-table-border-color);
-  --docsearch-container-background: rgba(0, 0, 0, 0.6);
+    --docsearch-container-background: rgba(0, 0, 0, 0.6);
+  }
 }
 
 /* Content */

website/src/css/index.scss

@@ -260,6 +260,7 @@
   font-size: 18px;
   position: relative;
   background: none;
+  border: 0;
 }
 
 .GetStarted code:first-child::before {