Added a NPM packages.json list which manages
 JavaScript packages. Most important packages added
 is the Webpack package which acts as an assets
 bundler.
It is added in its most basic working form. This
 includes additional settings in `settings.py`
 and the template tags in `base.html`.
Please read the updated Readme.md to easily get
 started using Webpack for your new assets.

This is recommended. Also give names like
MASTER_THESIS = 'MA' to avoid magic strings and allow for easy
reference, e.g. thesis.type = ThesisLink.MASTER_THESIS. This sort
of thing helps in maintainability of the codebase, since if we want
to change the abbreviation to 'MASTER' for some reason, we have it
defined in one place, and not in 100 places in the code.