Added additional web accessability dependancies to dockerfile.

Author: RossBugginsNHS

src/jekyll-devcontainer/src/.devcontainer/packages.txt

@@ -1,6 +1,7 @@
 ca-certificates
 fonts-liberation
 libasound2
+libatk-adaptor
 libatk-bridge2.0-0
 libatk1.0-0
 libc6
@@ -32,5 +33,7 @@ libxrender1
 libxss1
 libxtst6
 lsb-release
+openbox
 wget
 xdg-utils
+xorg