docs,api-ref: added search filters (#4830)

* initial implementation of search modal

* added hit and search suggestions

* added support for multiple indices

* updated sample env

* added close when click outside dropdown

* test for mobile

* added mobile design

* added shortcut

* dark mode fixes

* added search to docs

* added plugins filter

* added React import

* moved filters to configurations

* handled error on page load

* change suggestion text

* removed hits limit

* handle select all

* open link in current tab

* change highlight colors

* added support for shortcuts + auto focus

* change header and footer

* redesigned search ui

www/api-reference/components/Search/EmptyQueryBoundary/index.tsx

@@ -0,0 +1,21 @@
+import { useInstantSearch } from "react-instantsearch"
+
+type SearchEmptyQueryBoundaryProps = {
+  children: React.ReactNode
+  fallback: React.ReactNode
+}
+
+const SearchEmptyQueryBoundary = ({
+  children,
+  fallback,
+}: SearchEmptyQueryBoundaryProps) => {
+  const { indexUiState } = useInstantSearch()
+
+  if (!indexUiState.query) {
+    return fallback
+  }
+
+  return children
+}
+
+export default SearchEmptyQueryBoundary