Updated release script: New install webpage location.

Thanks to xet7 !

releases/release-website.sh

@@ -20,7 +20,7 @@ cd ~/repos/w/wekan.github.io
 git pull
 
 # 4) Change version number in website
-sed -i "s|>v$1<\/span>|>v$2<\/span>|g" index.html
+sed -i "s|>v$1<\/span>|>v$2<\/span>|g" install/index.html
 
 # 5) Change version number in API docs index page
 cd api