Updated build with new hero images

Author: krivard

content/blog/2021-09-30-ensemble-analysis.html

@@ -10,8 +10,8 @@
   - ryan
   - evanray
   - roni
-heroImage: blog-lg-vaccine-2.jpg
-heroImageThumb: blog-thumb-vaccine-2.jpg
+heroImage: ensemble-hero.jpg
+heroImageThumb: ensemble-thumb.jpg
 summary: |
   An analysis of coverage and accuracy of the COVID-19 Forecast Hub ensemble
   model shows that cases, hospitalizations, and deaths exhibit different degrees