Stop bundling Mopidy.js

Fixes #1460

docs/api/js.rst

@@ -12,28 +12,9 @@ instead of figuring out how to communicate with Mopidy.
Getting the library for browser use
===================================

Regular and minified versions of Mopidy.js, ready for use, is installed
together with Mopidy. When the HTTP extension is enabled, the files are
available at:

- http://localhost:6680/mopidy/mopidy.js
- http://localhost:6680/mopidy/mopidy.min.js

You may need to adjust hostname and port for your local setup.

Thus, if you use Mopidy to host your web client, like described in
:ref:`static-web-client`, you can load the latest version of Mopidy.js by
adding the following script tag to your HTML file:

.. code-block:: html

    <script type="text/javascript" src="/mopidy/mopidy.min.js"></script>

If you don't use Mopidy to host your web client, you can find the JS files in
the Git repo at:

- ``mopidy/http/data/mopidy.js``
- ``mopidy/http/data/mopidy.min.js``
Regular and minified versions of Mopidy.js, ready for use, is available from
the project's
`GitHub release page <https://github.com/mopidy/mopidy.js/releases>`_.


Getting the library for Node.js or Browserify use

docs/changelog.rst

@@ -38,6 +38,11 @@ Extension support
HTTP frontend
-------------

- Stop bundling Mopidy.js and serving it at ``/mopidy/mopidy.js`` and
  ``/mopidy/mopidy.min.js``. All Mopidy web clients must use Mopidy.js from npm
  or vendor their own copy of the library.
  (Fixes: :issue:`1460`, PR: :issue:`1708`)

- Remove support for serving arbitrary files over HTTP through the use of
  :confval:`http/static_dir`, which has been deprecated since 1.0. (Fixes:
  :issue:`1463`, PR: :issue:`1706`)