fix(typedoc.json): remove extends

Author: MYoung25

smithy-typescript-codegen/src/main/resources/software/amazon/smithy/typescript/codegen/typedoc.json

@@ -1,5 +1,4 @@
 {
-  "extends": ["../../typedoc.client.json"],
   "entryPoints": ["src/index.ts"],
   "out": "docs",
   "readme": "README.md"