Nice doc series. Perhaps consider linking your lines documentation in the todo docs as an example of how to shift items around? Every time vimwiki/todo.txt comes up here people bring up how to move/delete completed items, often because they're unaware of :move and friends.
Note: Your .vimrc link in configuration¹ is broken.
Edit: After re-reading my comment it sounds like a complaint, it wasn't meant that way and I hope it didn't come across that way. I did enjoy reading your series!
I was looking for more pointers on the later, I wrote a little on using Vim Wiki for managing todo list, always on the look out for more tips.
Here's the TLDR;
- Install Vim wiki plugin
- Convert line to checkboxes using ctrl-space
- Use ctrl-space to mark complete
- Use gln to toggle partial complete (glp for previous)
- gl<Space> to remove checkbox
A little more at: https://mkaz.blog/working-with-vim/vimwiki/