I wrote a single web page that can be easily deployed to showcase your astronomy pics online.
This is my demo:
https://apom.mellican.com/
The source code, setup and usage instructions are on Github:
https://github.com/meltaxa/apom
Simply download the zip from Github; unpack in a designated web site folder; add your pictures to the images folder (in a numbered sequential order) and then visit the web page.