The return of static site generator?

I'm a maintainer of a few websites purely as a hobby and I'm facing a situation that the technologies they are based on are aging.

• Catz application engine based on Mojolicious was written in Perl over ten years ago
• Photo galleries use a commercial jAlbum software
• Other sites are running DokuWiki and I've been using it over eight years now

At the moment everything is working fine but It is clear that in forthcoming years something must be done because the aging technologies.

Some of the alternatives are

1. To start using a full-blown CMS
2. To start using a minimal CMS like Grav CMS
3. Write something dynamic, so build my own dynamic site software
4. Use a static site generator software like Jekyll or Hugo
5. Write my own static site generator

The basic requirements for the solutions are

• Should have a minimum of ten years of practical painless lifetime.
• Should be able to run both on Windows (workstation) and Linux (workstation, server).
• I have written web content starting from 1994. This should be the last project where I need to convert the content into a new format. In future the web front end changes shouldn't require a content format conversion.

The solution should be able to handle

• first some basic wiki-like content and its navigation
• second a little more complex site involving some data processing / page generation
• then photo galleries
• and finally a static version of catza.net after the practical lifetime of the technologies behind catza.net come to an end

Static site generators seem have made a comeback. Using a static site generator would close the circle for me since I used to use a custom static site generator written in Perl from 2004 to 2011.

to be continued