For a quick & dirty solution, I would create HTML widget and insert into Global header.

In Appearance -> Custom Javascript, I would add the magic here.
You can upload the images into Public folder and then create an array in the javascript.

You can grab the title via the <meta name="title" content="Cat title"> tag and match it up with the images array. This is very manual so every time you change the category name you'll have to change in the javascript code as well. I take it though category name won't change that much when Live.

I have not tried this yet as It's just in theory.

@dogs
Not sure if this is still relevant to you, but I followed your code and was getting the same results. The code wasn't firing despite having a console log in the theme.js file.

Then I decided to click on the 'Clone widgets from...' and selected 'Categories'. After that all of the .tpl names showed up in the drop down. After that any changes to the theme.js file are firing as should.

Make sure you build and restart. I am using the included GRUNT to make development faster. Cheers!

Looks to be a theme templating solution.

I've looked everywhere and not sure if I'm just not finding the option or it doesn't exists. Is it possible to show the category description when you are on the category page itself?

In the sample image, I'd like to show the description right under the title "News Headlines". Thanks

Just a thought.... For internal use you can do whatever you want, but if you're publishing these urls onto the web I don't understand why you would seek this. It would be much simpler to just keep it in one URL and do a redirect from the other URL. Also it's bad for SEO if you have two urls pointing to the same forum generating "duplicate" content.

Maybe you can enlighten me.

@nodeham try downloading the Quill Editor plugin to replace the default Markdown editor. Quill has an option to convert previously post into Quill format which might help remove the HTML tags. I have not tried it since I used Redact instead. Redact doesn't have that conversion option though.

At the very least you need a host with shell access. Ideally on a VPS or Dedicated host so you have all the controls at your fingertips.

For Apache:

ProxyPassReverseCookiePath /nodebb /
RequestHeader set X-Forwarded-Port "443"
RequestHeader set X-Forwarded-Proto "https"