chore: added a 404 page button to direct back to the docs (#505)

Author: JoblersTune

src/content/docs/404.mdx

@@ -0,0 +1,12 @@
+---
+title: 404 - Page Not Found
+description: Page not found. Check the URL or try using the search bar.
+template: splash
+hero:
+  tagline: Page not found. Check the URL or try using the search bar.
+  actions:
+    - text: Go to the docs
+      link: /docs
+      icon: open-book
+      variant: primary
+---