Scaling Akvorado BMP RIB with sharding

As a single data point to a recent meta story about LLMs on Lobsters, this post is copy edited by an LLM. As I plan to write a post about this in the future, I kept the edits in a separate commit.

I didn't time how much work this post was, but the diagrams alone took several hours and I've got distracted by finding more optimizations (but that's one reason to write a blog post: challenge yourself before going public) and SVG-related stuff (related to auto-dark mode feature of draw.io).