WEB: about/index has the extension wrong

[datapythonista]

xref: #28580 (comment)

Looks like the file web/pandas/about/index.html has the wrong extension .html, since it's a markdown file and should be .md. This is causing that the file is not rendered as html but left untouched in the website: https://dev.pandas.io/about/index.html

[est271]

mind if I take a shot at this issue?

[datapythonista]

Please go ahead @est271, thanks for helping with this.