Switch docs to MKDocs (#602)

Fixes #601. Merged in 6f87b32 from the md3 branch and did a lot of cleanup.

Changes include:

* Removed old docs build tool, templates, etc.

* Added MkDocs config file, etc.

* filename.txt => filename.md

* pythonhost.org/Markdown => Python-Markdown.github.io

* Markdown lint and other cleanup.

* Automate pages deployment in makefile with `mkdocs gh-deploy`

    Assumes a git remote is set up named "pages". Do

        git remote add pages https://github.com/Python-Markdown/Python-Markdown.github.io.git

    ... before running `make deploy` the first time.

1 files changed, 0 insertions, 77 deletions

diff --git a/docs/release-2.4.txt b/docs/release-2.4.txt
deleted file mode 100644
index f1d00af..0000000
--- a/docs/release-2.4.txt
+++ /dev/null
@@ -1,77 +0,0 @@
-title:      Release Notes for v2.4
-prev_title: Release Notes for v2.5
-prev_url:   release-2.5.html
-next_title: Release Notes for v2.3
-next_url:   release-2.3.html
-
-Python-Markdown 2.4 Release Notes
-=================================
-
-We are pleased to release Python-Markdown 2.4 which adds one new extension
-and fixes various bugs. See the list of changes below for details.
-
-Python-Markdown supports Python versions 2.6, 2.7, 3.1, 3.2, and 3.3.
-
-Backwards-incompatible Changes
-------------------------------
-
-* The `force_linenos` configuration setting of the CodeHilite extension has been
-marked as **Deprecated**. It had previously been marked as "Pending Deprecation"
-in version 2.3 when a new setting `linenums` was added to replace it. See 
-documentation for the [CodeHilite Extension] for an explanation of the new 
-`linenums` setting. The new setting will honor the old `force_linenos` if it 
-is set, but `force_linenos` will raise a `DeprecationWarning` and will likely 
-be removed in a future version of Python-Markdown.
-
-[CodeHilite Extension]: extensions/code_hilite.html
-
-* URLs are no longer percent-encoded. This improves compatibility with the
-original (written in Perl) Markdown implementation. Please percent-encode
-your URLs manually when needed.
-
-What's New in Python-Markdown 2.4
----------------------------------
-
-* Thanks to the hard work of [Dmitry Shachnev] the [Smarty Extension] has been 
-added, which implements [SmartyPants] using Python-Markdown's Extension API. 
-This offers a few benefits over a third party script. The HTML does not need
-to be "tokenized" twice, no hacks are required to combine SmartyPants and
-code highlighting, and we get markdown's escaping feature for free. Please try 
-it out and report bugs and/or improvements.
-
-[Dmitry Shachnev]: https://github.com/mitya57
-[Smarty Extension]: extensions/smarty.html
-[SmartyPants]: http://daringfireball.net/projects/smartypants/
-
-* The [Table of Contents Extension] now supports new `permalink` option
-for creating [Sphinx]-style anchor links.
-
-[Table of Contents Extension]: extensions/toc.html
-[Sphinx]: http://sphinx-doc.org/
-
-* It is now possible to enable Markdown formatting inside HTML blocks by
-appending `markdown=1` to opening tag attributes. See [Markdown Inside HTML
-Blocks] section for details. Thanks to [ryneeverett] for implementing this
-feature.
-
-[Markdown Inside HTML Blocks]: extensions/extra.html#nested-markdown-inside-html-blocks
-[ryneeverett]: https://github.com/ryneeverett
-
-* The code blocks now support emphasizing some of the code lines. To use this
-feature, specify `hl_lines` option after language name, for example (using
-the [Fenced Code Extension]):
-
-        ```.python hl_lines="1 3"
-        # This line will be emphasized.
-        # This one won't.
-        # This one will be also emphasized.
-        ```
-
-    Thanks to [A. Jesse Jiryu Davis] for implementing this feature.
-
-[Fenced Code Extension]: extensions/fenced_code_blocks.html
-[A. Jesse Jiryu Davis]: https://github.com/ajdavis
-
-* Various bug fixes have been made.  See the
-[commit log](https://github.com/Python-Markdown/markdown/commits/master)
-for a complete history of the changes.