text: Title: Installer for Quokka Package Index qpi
  Body: There is a new repo https://github.com/quokkaproject/qpi
  
  we need to develop a command line app
  
  ```
  pip install quokka-installer
  ```
  
  Now user can use this to install themes and modules
  
  ```
  quokka-installer install theme material
  ```
  
  The above code reads qpi/themes and looks for "material" metadata, downloads theme files and unpack it in /themes folder. If --activate is passed it sets the new theme as the active.
  
  The same for modules.
  