PRS: Add CNAME generation and rel="canonical"

Author: AA-Turner

conf.py

@@ -56,6 +56,7 @@
 html_use_index = False  # Disable index (we use PEP 0)
 html_style = ""  # must be defined here or in theme.conf, but is unused
 html_permalinks = False  # handled in the PEPContents transform
+html_baseurl = "https://peps.python.org"  # to create the CNAME file
 gettext_auto_build = False  # speed-ups
 
 templates_path = ['pep_sphinx_extensions/pep_theme/templates']  # Theme template relative paths from `confdir`

pep_sphinx_extensions/pep_theme/templates/page.html

@@ -7,6 +7,7 @@
     <meta name="color-scheme" content="light dark" />
     <title>{{ title + " | peps.python.org"|safe }}</title>
     <link rel="shortcut icon" href="{{ pathto('_static/py.png', resource=True) }}"/>
+    <link rel="canonical" href="{{ pageurl|escape }}" />
     <link rel="stylesheet" href="{{ pathto('_static/style.css', resource=True) }}" type="text/css" />
     <link rel="stylesheet" href="{{ pathto('_static/mq.css', resource=True) }}" type="text/css" />
     <link rel="stylesheet" href="{{ pathto('_static/dark.css', resource=True) }}" type="text/css" media="(prefers-color-scheme: dark)" id="css-dark"/>