Feat/startup config api (#518)

* feat: add api for config

* feat: add data service to client

* feat: update client pages with values from config endpoint

* test: update tests

* Update configurations and documentation to remove VITE_SHOW_GOOGLE_LOGIN_OPTION and change VITE_APP_TITLE to APP_TITLE

* include APP_TITLE with startup config

* Add test for new route

* update backend-review pipeline

* comment out test until we can figure out testing routes in CI

* update: .env.example

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Co-authored-by: fuegovic <32828263+fuegovic@users.noreply.github.com>

client/src/components/Input/Footer.tsx

@@ -0,0 +1,20 @@
+import React from 'react';
+import { useGetStartupConfig } from '~/data-provider';
+
+export default function Footer() {
+  const { data: config } = useGetStartupConfig();
+  return (
+    <div className="hidden px-3 pb-1 pt-2 text-center text-xs text-black/50 dark:text-white/50 md:block md:px-4 md:pb-4 md:pt-3">
+      <a
+        href="https://github.com/danny-avila/LibreChat"
+        target="_blank"
+        rel="noreferrer"
+        className="underline"
+      >
+        {config?.appTitle || 'LibreChat'}
+      </a>
+      . Serves and searches all conversations reliably. All AI convos under one house. Pay per call
+      and not per month (cents compared to dollars).
+    </div>
+  );
+}