LayoutService: Implemented support for sub-urls

src/config.ts

+export const BASE_URL = "/infoscreen"; // No trailing slash

src/services/LayoutService.ts

 import {LayoutConfig} from "../types/LayoutConfig";
+import {BASE_URL} from "../config";
 
 const NO_LAYOUT_CONFIG: LayoutConfig = {
   id: "",
@@ -13,9 +14,9 @@ export class LayoutService {
 
   static async init(): Promise<void> {
     try {
-      const activeConfigs = await fetch("/activeConfigs.json").then(content => content.json());
+      const activeConfigs = await fetch(BASE_URL + "/activeConfigs.json").then(content => content.json());
       const configFetches = (activeConfigs as string[])
-        .map(configPath => fetch(configPath).then(content => content.json()));
+        .map(configPath => fetch(BASE_URL + "/" + configPath).then(content => content.json()));
 
       LayoutService.configs = await Promise.all(configFetches);
     } catch (e) {