Update URLs of redirected links

git_version_control.rst

@@ -213,7 +213,8 @@ A list of patterns in a file called :file:`.gitignore` in the top level director
 There is more information about :file:`.gitignore` files in the "Ignoring Files" section of https://git-scm.com/book/en/v2/Git-Basics-Recording-Changes-to-the-Repository.
 
 You can create your own :file:`.gitignore` files by hand,
-or use a template like https://github.com/github/gitignore/blob/master/Python.gitignore as a starting point.
+or use a template like https://github.com/github/gitignore/blob/main/Python.gitignore
+as a starting point.
 
 .. note::
     Be sure to add and commit your :file:`.gitignore` file after you create it,

oceanparcels/index.rst

@@ -24,7 +24,7 @@ Useful links:
 * `Ben's notebook`_ that demonstrates a complete workflow of using OceanParcels simulations with SalishSeaCast and related model configurations
 
 .. _OceanParcels project site: https://oceanparcels.org/
-.. _#oceanparcels Slack channel: https://salishseacast.slack.com/archives/C02ETTPHFPX
+.. _#oceanparcels Slack channel: https://salishseacast.slack.com/?redir=%2Farchives%2FC02ETTPHFPX
 .. _OceanParcels Gitter chat rooms: https://gitter.im/OceanPARCELS/home
 .. _Ocean Sciences 2021 paper comparing OceanParcels and Ariane: https://os.copernicus.org/articles/17/1067/2021/
 .. _Advection kernels: https://oceanparcels.org/gh-pages/html/_modules/parcels/application_kernels/advection.html

python_packaging/pkg_structure.rst

@@ -30,7 +30,7 @@ References
 * `Brett Canon's Clarifying PEP 518 (a.k.a. pyproject.toml) blog post`_
 * `the Flit packaging and publisher tool`_
 
-.. _Python Packaging User Guide: https://packaging.python.org/
+.. _Python Packaging User Guide: https://packaging.python.org/en/latest/
 .. _Setuptools Documentation: https://setuptools.pypa.io/en/latest/index.html
 .. _Hynek Schlawack's Testing & Packaging blog post: https://hynek.me/articles/testing-packaging/
 .. _Ionel Cristian Mărieș's Packaging a python library blog post: https://blog.ionelmc.ro/2014/05/25/python-packaging/
@@ -61,7 +61,7 @@ References
        that is,
        :command:`python3 -m pip install --user -e`.
 
-       .. _"user scheme" for installation: https://packaging.python.org/tutorials/installing-packages/#installing-to-the-user-site
+       .. _"user scheme" for installation: https://packaging.python.org/en/latest/tutorials/installing-packages/#installing-to-the-user-site
 
 
 Package Layout
@@ -267,7 +267,7 @@ looks like:
 The :kbd:`[options.entry_points]` stanza is an example of the declaration of `entry points`_.
 They are used in packages that use a framework like `Click`_ or `Cliff`_ to provide a command-line interface.
 
-.. _entry points: https://packaging.python.org/guides/creating-and-discovering-plugins/#using-package-metadata
+.. _entry points: https://packaging.python.org/en/latest/guides/creating-and-discovering-plugins/#using-package-metadata
 .. _Click: https://palletsprojects.com/p/click/
 .. _Cliff: https://docs.openstack.org/cliff/latest/