Replace links to freewisdom.org

Yuri's site (freewisdom.org) has gone offline. I have linked to his
GitHub profile instead. Also, the developer's email address
(markdown@freewisdom.org) has been replaced with a new address
(python.markdown@gmail.com). The new address simply forwards all
incoming messages to the project developer (@waylan) and deletes the
messages.

Author: waylan

CODE_OF_CONDUCT.md

@@ -35,7 +35,7 @@ This Code of Conduct applies both within project spaces and in public spaces
 when an individual is representing the project or its community.
 
 Instances of abusive, harassing, or otherwise unacceptable behavior may be
-reported by contacting a project maintainer at markdown@freewisdom.org. All
+reported by contacting a project maintainer at python.markdown@gmail.com. All
 complaints will be reviewed and investigated and will result in a response that
 is deemed necessary and appropriate to the circumstances. Maintainers are
 obligated to maintain confidentiality with regard to the reporter of an

docs/authors.md

@@ -22,7 +22,7 @@ Primary Authors
     and has been assisting with maintenance, reviewing pull requests and ticket
     triage.
 
-* __[Yuri Takteyev](http://freewisdom.org/)__
+* __[Yuri Takteyev](https://github.com/yuri)__
 
     Yuri wrote most of the code found in version 1.x while procrastinating his
     Ph.D. Various pieces of his code still exist, most notably the basic

docs/contributing.md

@@ -9,7 +9,7 @@ propose changes to this document in a pull request.
 
 This project and everyone participating in it is governed by the
 [Python-Markdown Code of Conduct]. By participating, you are expected to uphold
-this code. Please report unacceptable behavior to [markdown@freewisdom.org][email].
+this code. Please report unacceptable behavior to <python.markdown@gmail.com>.
 
 ## Project Organization
 
@@ -478,7 +478,6 @@ label from the same group.
 
 [Python-Markdown Organization]: https://github.com/Python-Markdown
 [Python-Markdown Code of Conduct]: https://github.com/Python-Markdown/markdown/blob/master/CODE_OF_CONDUCT.md
-[email]: mailto:markdown@freewisdom.org
 [Python-Markdown/markdown]: https://github.com/Python-Markdown/markdown
 [issue tracker]: https://github.com/Python-Markdown/markdown/issues
 [syntax rules]: https://daringfireball.net/projects/markdown/syntax

setup.py

@@ -69,9 +69,9 @@ def get_version():
     long_description=long_description,
     long_description_content_type='text/markdown',
     author='Manfred Stienstra, Yuri takhteyev and Waylan limberg',
-    author_email='waylan.limberg@icloud.com',
+    author_email='python.markdown@gmail.com',
     maintainer='Waylan Limberg',
-    maintainer_email='waylan.limberg@icloud.com',
+    maintainer_email='python.markdown@gmail.com',
     license='BSD License',
     packages=['markdown', 'markdown.extensions'],
     python_requires='>=3.6',