Add configurable title and subtitle v0.6.1

app/static/app.js

@@ -20,6 +20,7 @@ const $$ = (selector) => [...document.querySelectorAll(selector)];
 
 const elements = {
   appName: $('#app-name'),
+  appSubtitle: $('#app-subtitle'),
   openButtons: [$('#open-folder'), $('#open-folder-top'), $('#open-folder-center')],
   rescan: $('#rescan-folder'),
   folderName: $('#folder-name'),
@@ -1029,8 +1030,10 @@ async function initialise() {
     const response = await fetch('/api/config', { cache: 'no-store' });
     if (response.ok) {
       const config = await response.json();
-      elements.appName.textContent = config.appName;
-      document.title = config.appName;
+      const pageTitle = config.appTitle || config.appName;
+      elements.appName.textContent = pageTitle;
+      elements.appSubtitle.textContent = config.appSubtitle;
+      document.title = pageTitle;
       state.mapConfig = config;
     }
   } catch {}