Add case study: Booking.com (#20783)

* Create index.html

* add logos

* fix logo file name

* add booking.com images

* remove Nav from featured

* add booz allen featured logo

* make Booz Allen featured

* remove spotify from featured

* fix booz allen front matter

* add correct logo

* add correct booz allen logo

content/en/case-studies/spotify/index.html

@@ -4,11 +4,7 @@ linkTitle: Spotify
 case_study_styles: true
 cid: caseStudies
 css: /css/style_case_studies.css
-logo: spotify_featured_logo.png
-featured: true
-weight: 2
-quote: >
-   We saw the amazing community that’s grown up around Kubernetes, and we wanted to be part of that. We wanted to benefit from added velocity and reduced cost, and also align with the rest of the industry on best practices and tools.
+featured: false
 ---
 
 <div class="banner1" style="background-image: url('/images/CaseStudy_spotify_banner1.jpg')">