I am trying to change the URLs from a folder based structure so that an old site I am bringing over to Hugo keeps its existing URL structure with URLs ending in .htm.
I am unable to figure out how to do this. I have read the documentation and it seems it it either out of date or I am doing it wrong 
Here is my config.yml:
mediaTypes:
mediaTypes.text/html:
suffixes:
- .htm
outputFormats:
outputFormats.HTML:
mediaType: "text/html"
permalinks:
posts: "/newsletters/newsletter_:06:month"
tags: "/tags/:slug"
This config does not work as all the URLs end in .html
Please help me or point me in the correct direction. Thank you in advance!