Move feedburner config to wiki

Fixes #2386

https://github.com/getpelican/pelican/wiki/FeedBurner-Configuration

docs/settings.rst

@@ -954,27 +954,6 @@ variables to ``None``.
 .. [2] ``{slug}`` is replaced by name of the category / author / tag.
 
 
-FeedBurner
-----------
-
-If you want to use FeedBurner for your feed, you will likely need to decide
-upon a unique identifier. For example, if your site were called "Thyme" and
-hosted on the www.example.com domain, you might use "thymefeeds" as your unique
-identifier, which we'll use throughout this section for illustrative purposes.
-In your Pelican settings, set the ``FEED_ATOM`` attribute to
-``thymefeeds/main.xml`` to create an Atom feed with an original address of
-``http://www.example.com/thymefeeds/main.xml``. Set the ``FEED_DOMAIN``
-attribute to ``http://feeds.feedburner.com``, or ``http://feeds.example.com``
-if you are using a CNAME on your own domain (i.e., FeedBurner's "MyBrand"
-feature).
-
-There are two fields to configure in the `FeedBurner
-<http://feedburner.google.com>`_ interface: "Original Feed" and "Feed Address".
-In this example, the "Original Feed" would be
-``http://www.example.com/thymefeeds/main.xml`` and the "Feed Address" suffix
-would be ``thymefeeds/main.xml``.
-
-
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