I think in this case it will be easier to write. I did a similar mini-CMS for some simple sites-business cards: creating a basic database with content (two fields — id and content, and files do), put the editor (e.g., TinyMCE or any that you like) and created a single template output for all pages of the website. This CMS
, by the way, very popular in the West. Don't know if we have similar counterparts, were not looking.