Update blog posts in pkgdown (#5305)

* Add link to 3.4.0 blog post in _pkgdown.yml

* Update links of blog posts to posit.co

Author: olivroy

_pkgdown.yml

@@ -264,6 +264,8 @@ articles:
 
 news:
   releases:
+  - text: "Version 3.4.0"
+    href: https://www.tidyverse.org/blog/2022/11/ggplot2-3-4-0/
   - text: "Version 3.3.0"
     href: https://www.tidyverse.org/blog/2020/03/ggplot2-3-3-0/
   - text: "Version 3.2.0"
@@ -273,13 +275,13 @@ news:
   - text: "Version 3.0.0"
     href: https://www.tidyverse.org/articles/2018/07/ggplot2-3-0-0/
   - text: "Version 2.2.0"
-    href: https://blog.rstudio.com/2016/11/14/ggplot2-2-2-0/
+    href: https://posit.co/blog/ggplot2-2-2-0/
   - text: "Version 2.1.0"
-    href: https://blog.rstudio.com/2016/03/03/ggplot2-2-1-0/
+    href: https://posit.co/blog/ggplot2-2-1-0/
   - text: "Version 2.0.0"
-    href: https://blog.rstudio.com/2015/12/21/ggplot2-2-0-0/
+    href: https://posit.co/blog/ggplot2-2-0-0/
   - text: "Version 1.0.0"
-    href: https://blog.rstudio.com/2015/01/09/ggplot2-updates/
+    href: https://posit.co/blog/ggplot2-updates/
 
 navbar:
   structure: