PEP page include extra <html>, </html> etc. #986
Description
PEP pages like https://www.python.org/dev/peps/pep-0526/ seem to take an existing HTML document (for a PEP) and then copy it verbatim into the HTML generated for this site.
This results in malformed HTML (see also https://validator.w3.org/nu/?doc=https%3A%2F%2Fwww.python.org%2Fdev%2Fpeps%2Fpep-0526%2F), as now in the middle of the HTML body, there is another set of elements <html>, <head>, <body> etc..
I think at the very least, these should be stripped, and only the content of the body element be inserted into the generated HTML.