Styleguide: Remove properties section since it has been moved to TTK styleguide
Styleguide: Minor changes on imports
License cleanups
Cleanups
Docs: Change command to rebuild assets after customization
Docs cleanup: Use code-block
Docs: Include a note about building the assets in the installation docs

If installing directly from the sources, without running these commands
Pootle won't run given the default configuration created by `pootle init`.
Cleanup: Store middleware in a single place
Styleguide: Guidelines for defining fields in models and forms
Cleanup: Add some sections on styleguide

This will ease providing links to specific sections when referring to Pootle
styleguide.