DOC: Clean up linkcheck redirects

CONTRIBUTING.md

@@ -83,7 +83,7 @@ Add tests for your change(s). Make the tests pass:
 
     py.test
 
-Commit the changes you made. Chris Beams has written a [guide](https://chris.beams.io/posts/git-commit/) on how to write good commit messages.
+Commit the changes you made. Chris Beams has written a [guide](https://cbea.ms/git-commit/) on how to write good commit messages.
 
 Push to your fork and [submit a pull request][pr].
 

docs/conf.py

@@ -304,3 +304,10 @@
 
 # If true, do not generate a @detailmenu in the "Top" node's menu.
 #texinfo_no_detailmenu = False
+
+# Dictionary of URL redirects allowed
+linkcheck_allowed_redirects = {
+    r'https://doi.org/.*': r'https://.*',
+    r'https://gitter.im/Unidata/siphon': r'https://app.gitter.im/.*siphon.*',
+    r'https://codecov.io/github/Unidata/siphon': r'https://app.codecov.io/github/Unidata/siphon',
+}

docs/developerguide.rst

@@ -83,7 +83,7 @@ Code Style
 ----------
 
 Siphon uses the Python code style outlined in `PEP8
-<https://www.python.org/dev/peps/pep-0008/>`_. For better or worse, this is what the majority
+<https://peps.python.org/pep-0008/>`_. For better or worse, this is what the majority
 of the Python world uses. The one deviation is that line length limit is 95 characters. 80 is a
 good target, but some times longer lines are needed.