Improve DevArt Aggregation.

[jfg956]

Right now, DevArt is as follow:

[com_devart_mysql_tool]
  title = Devart MySQL Tool Blog
  link = https://blog.devart.com/category/products/mysql-tools
  feed = https://blog.devart.com/category/products/mysql-tools/feed
  twitter = DevartSoftware

Which did not aggregate below:

• https://blog.devart.com/how-to-configure-a-sql-server-linked-server-to-connect-to-mysql.html

Maybe change this to a filtered feed.