Add blog post: Valkey Bundle - One stop shop for real-time applications (#281)

### Description

This merge request adds a new blog post introducing Valkey Bundle as a
comprehensive solution for building low-latency, real-time applications.
 
## Changes
- **New blog post**:
2025-06-23-valkey-bundle-one-stop-shop-for-low-latency-modern-applications
- **New author profile**: Added rlunar.md author profile with
corresponding profile image
- **Assets**: Added Valkey Bundle diagram/image to illustrate the
concept

## Summary
The blog post covers:
- Introduction to Valkey Bundle as a one-stop solution
- Benefits for modern application development
- Focus on low-latency and real-time use cases

## Checklist
- [x] Content follows the site's style guidelines
- [x] Images are optimized and properly referenced
- [x] Author profile is complete
- [x] Blog post metadata is correctly formatted
- [x] Local build tested successfully

By submitting this pull request, I confirm that my contribution is made
under the terms of the BSD-3-Clause License.

---------

Signed-off-by: Roberto Luna Rojas <[email protected]>
Co-authored-by: Roberto Luna Rojas <[email protected]>
Co-authored-by: Roberto Luna Rojas <[email protected]>

Author: 3 people

content/authors/rlunar.md

@@ -0,0 +1,8 @@
+---
+title: Roberto Luna-Rojas
+extra:
+    photo: '/assets/media/authors/rlunar.jpg'
+    github: rlunar
+---
+
+Roberto Luna Rojas is a Sr Developer Advocate for Valkey based in the USA, originally from Mexico. He tries to get the most out of in-memory databases one bit at the time. When not in front of the computer, he loves spending time with his family, listening to music, and watching movies, TV shows, and sports.