Instructions for the npm upgrade missing

[vanschelven]

The docs have instructions for installing django-tailwind, but not for keeping stuff up-to-date.

I have found the following to work, but I'm not sure whether it constitutes a complete set of instructions:

rm theme/static_src/package-lock.json theme/static_src/node_modules/ -rf
python manage.py tailwind install

(this assumes you pick the standard name of theme for your theme)