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Use it to generate dist/converse-no-dependencies.js which we use to
generate the converse.pot file.

- Add postcss with autoprefixer and cleancss

- hot reloading
- split config into dev and prod

- Removes the need for generating and keeping json files

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

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

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

updates #1352

Also include the unminified versions for people who wants to modify
them.

'dependencies' in package.json get installed as well when installing
converse.js or @converse/headless in a 3rd party project, which is
unnecessary.

And fix an extra space added by mistake by the sed command on
_converse.VERSION_NAME in converse-core.js.

Add the version to the archive name so it also fixes #1375.
Remove the recipes for css/webfonts.zip, sounds.zip, and locale.zip.