refactor: centralize API client configuration with global Axios instance

This commit introduces a global API client configuration approach:
- Created a new `apiClient.ts` to manage a single, configurable Axios instance
- Removed individual API-specific Axios instance generators
- Updated client and query option generators to use the global API client
- Simplified API client configuration in the README
- Standardized method for setting and retrieving the API client across different API specifications

Author: owinter86

example/configs/apiClient.ts

@@ -0,0 +1,5 @@
+import axios from "axios";
+import { setApiClient } from "../generated/apiClient";
+
+const api = axios.create({ baseURL: "https://api.diks.acc.lightbase.nl" });
+setApiClient(api);

example/generated/apiClient.ts

@@ -0,0 +1,16 @@
+import type { AxiosInstance } from "axios";
+
+let apiClient: AxiosInstance;
+
+export function setApiClient(instance: AxiosInstance): void {
+	apiClient = instance;
+}
+
+export function getApiClient(): AxiosInstance {
+	if (!apiClient) {
+		throw new Error("API client not configured. Call setApiClient with an axios instance first.");
+	}
+	return apiClient;
+}
+
+export { apiClient };