Enhance ToggleTheme component and add Uptime link in Footer with translations

- Updated ToggleTheme component styles for better visibility in dark mode.
- Added a new Uptime link in the Footer for system status monitoring.
- Introduced translations for Uptime in English, Dutch, German, and French to support multilingual users.

src/components/UptimeStatus.astro

@@ -0,0 +1,15 @@
+---
+import UptimeStatusIsland from './UptimeStatusIsland.jsx';
+import UpdateTimer from './UpdateTimer.jsx';
+---
+<UpdateTimer client:only="react" onRefresh={() => {}} />
+<UptimeStatusIsland client:only="react" />
+
+
+<style>
+/**** Custom grid for 40 heartbeat squares ****/
+.grid-cols-40 {
+  display: grid;
+  grid-template-columns: repeat(40, minmax(0, 1fr));
+}
+</style>