AS you've already grouped your content into categories (cat care etc) that would be fairly simple to transfer into a wordpress content management system. The slight difficulty would come in presenting it in the way it is currently done, this would require a bit of custom coding in a theme. This isn't particularly expensive to pay for, or even that hard to learn for yourself as the wordpress codex is well documented. Overall, not too bad but at the same time I doubt there is an off the shelf solution if you want content displayed in the same way as now.
Well, all you have to do mostly is copy and paste the code. I mean, you will have to make some edits but all in all it's not very hard at all. Check the Wordpress.org docs for more help, I'm sure they have something there that will help you do this.
The problem I saw with the code was running multiple loops on a page - so that the list of different articles on cat care as well as a changing main post could be shown. Although I guess you could use static text with just one loop.