Don't dispose store in SSR (#210)

Author: rohit-gohri

.changeset/spicy-eels-sleep.md

@@ -0,0 +1,5 @@
+---
+'docusaurus-theme-redoc': patch
+---
+
+Fix worker.terminate error in SSR

packages/docusaurus-theme-redoc/src/utils/useSpec.ts

@@ -59,9 +59,10 @@ export function useSpec(
       optionsOverrides,
     );
 
-    if (currentStore !== null) {
+    if (currentStore !== null && isBrowser) {
       currentStore.dispose();
     }
+
     currentStore = new AppStore(
       // eslint-disable-next-line @typescript-eslint/no-explicit-any
       spec as any,