Remove Makefile.win and add build instructions for Windows based on NPM
scripts.

Also add docstrings.

Signed-off-by: Maxime “pep” Buquet <pep@bouah.net>

because @converse-headless wasn't available

which logs less on the INFO loglevel

Remove demo/without_bundled_dependencies.html

That way the tarball we upload to Github is the same as the one that we
get from installing Converse via NPM.

CC @ChaosKid42

To create the tarball containing the assets, just run `npm pack`.
This is the same tarball that gets uploaded to https://npmjs.org

when were generating only the CSS

Removed CSS rules which don't appear to be used anywhere.

This is a precursor to also testing (and implementing) that a chat pages
through MAM results (see #1549)

Remove unused method.