https://bluefish.openoffice.nl/index.html
https://bfwiki.tellefsen.net/index.php/Installing_Bluefish#Installing_the_very_latest_on_Ubuntu_Linux
sudo apt-get install bluefish
Format code in Bluefish?
https://superuser.com/questions/417979/format-code-in-bluefish
http://www.gtalbot.org/linux-section/web-authoring/html-tidy/how-to-use-HTML-tidy-with-bluefish.html