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, 135 deletions

diff --git a/docs/extensions/wikilinks.txt b/docs/extensions/wikilinks.txt
deleted file mode 100644
index 948b957..0000000
--- a/docs/extensions/wikilinks.txt
+++ /dev/null
@@ -1,135 +0,0 @@
-title:      WikiLinks Extension
-prev_title: Table of Contents Extension
-prev_url:   toc.html
-next_title: Extension API
-next_url:   api.html
-
-WikiLinks
-=========
-
-Summary
--------
-
-The WikiLinks extension adds support for [WikiLinks][]. Specifically, any
-``[[bracketed]]`` word is converted to a link.
-
-This extension is included in the standard Markdown library.
-
-[WikiLinks]: http://en.wikipedia.org/wiki/Wikilink
-
-Syntax
-------
-
-A ``[[bracketed]]`` word is any combination of  upper or lower case letters,
-number, dashes, underscores and spaces surrounded by double brackets. Therefore
-
-    [[Bracketed]]
-
-would produce the following HTML:
-
-    <a href="/Bracketed/" class="wikilink">Bracketed</a>
-
-Note that WikiLinks are automatically assigned `class="wikilink"` making it
-easy to style WikiLinks differently from other links on a page if one so
-desires. See below for ways to alter the class.
-
-Also note that when a space is used, the space is converted to an underscore in
-the link but left as-is in the label. Perhaps an example would illustrate this
-best:
-
-    [[Wiki Link]]
-
-becomes
-
-    <a href="/Wiki_Link/" class="wikilink">Wiki Link</a>
-
-Usage
------
-
-See [Extensions](index.html) for general extension usage, specify `markdown.extensions.wikilinks`
-as the name of the extension.
-
-See the [Library Reference](../reference.html#extensions) for information about
-configuring extensions.
-
-The default behavior is to point each link to the document root of the current
-domain and close with a trailing slash. Additionally, each link is assigned to
-the HTML class `wikilink`.
-
-The following options are provided to change the default behavior:
-
-* **`base_url`**: String to append to beginning of URL.
-
-    Default: `'/'`
-
-* **`end_url`**: String to append to end of URL.
-
-    Default: `'/'`
-
-* **`html_class`**: CSS class. Leave blank for none.
-
-    Default: `'wikilink'`
-
-* **`build_url`**: Callable which formats the URL from its parts.
-
-### Examples ###
-
-For an example, let us suppose links should always point to the sub-directory
-`/wiki/` and end with `.html`
-
-    >>> from markdown.extensions.wikilinks import WikiLinkExtension
-	>>> html = markdown.markdown(text,
-    ...     extensions=[WikiLinkExtension(base_url='/wiki/', end_url='.html')]
-    ... )
-
-The above would result in the following link for `[[WikiLink]]`.
-
-    <a href="/wiki/WikiLink.html" class="wikilink">WikiLink</a>
-
-If you want to do more that just alter the base and/or end of the URL, you
-could also pass in a callable which must accept three arguments (``label``,
-``base``, and ``end``). The callable must return the URL in it's entirety.
-
-    >>> def my_url_builder(label, base, end):
-    ...    # do stuff
-    ...    return url
-	...
-    >>> html = markdown.markdown(text,
-    ...     extensions=[WikiLinkExtension(build_url=my_url_builder)],
-    ... )
-
-The option is also provided to change or remove the class attribute.
-
-    >>> html = markdown.markdown(text,
-    ...     extensions=[WikiLinkExtension(html_class='myclass')]
-    ... )
-
-Would cause all WikiLinks to be assigned to the class `myclass`.
-
-    <a href="/WikiLink/" class="myclass">WikiLink</a>
-
-Using with Meta-Data extension
-------------------------------
-
-The WikiLink extension also supports the [Meta-Data](meta_data.html) extension.
-Please see the documentation for that extension for specifics. The supported
-meta-data keywords are:
-
-* `wiki_base_url`
-* `wiki_end_url`
-* `wiki_html_class`
-
-When used, the meta-data will override the settings provided through the
-`extension_configs` interface.
-
-This document:
-
-    wiki_base_url: http://example.com/
-    wiki_end_url:  .html
-    wiki_html_class:
-
-    A [[WikiLink]] in the first paragraph.
-
-would result in the following output (notice the blank `wiki_html_class`):
-
-    <p>A <a href="http://example.com/WikiLink.html">WikiLink</a> in the first paragraph.</p>