feat: upgrade to covidcast 2.0.0

Author: sgratzl

content/covidcast/release-log/headless/v2.0.0.md

@@ -0,0 +1,13 @@
+---
+title: v2.0.0
+date: 2021-03-05
+---
+
+### Signal Changes
+
+- Replaced "Vaccine Acceptance" with signal including both already received the vaccine and definitely or probably choose to get vaccinated.
+
+
+### New Features
+
+This release introduces the new mobile-first based COVIDcast website with a fresh new design.