[Kimchi-devel] [RFC] Removal of of developer UI

Background Developer UI is a legacy way for Kimchi to render html page to the front end. And the font end can display the html page directly without creating the page dynamically. After the design UI code went into Kimchi, developer UI is attracting less and less attention and have been broken for a while. Further, design UI is good enough and can replace the developer UI without any encumbrance. Maintaining two sets of UI brings a lot of extra works and is unnecessary. So it is reasonable to remove the design UI code from Kimchi repository. Work to be done: * Remove the code to support rendering html text in controller * Remove the code to generate html page from the cheetah template