feat: support non-singleton explorer

quartz/util/random.ts

@@ -0,0 +1,3 @@
+export function randomIdNonSecure() {
+  return Math.random().toString(36).substring(2, 8)
+}

quartz/util/resources.tsx

@@ -65,3 +65,10 @@ export interface StaticResources {
   js: JSResource[]
   additionalHead: (JSX.Element | ((pageData: QuartzPluginData) => JSX.Element))[]
 }
+
+export type StringResource = string | string[] | undefined
+export function concatenateResources(...resources: StringResource[]): StringResource {
+  return resources
+    .filter((resource): resource is string | string[] => resource !== undefined)
+    .flat()
+}