Most of them are already moved to the site repo:
https://git.picodata.io/picodata/picodata/docs/-/tree/97c3e35ec/docs

- `clustering.md` -> https://docs.picodata.io/picodata/clustering/
- `glossary.md` -> https://docs.picodata.io/picodata/glossary/
- `cli.md` -> https://docs.picodata.io/picodata/cli/
- `discovery.md` -> https://docs.picodata.io/picodata/discovery/
- `sharding.md` -> /dev/null
- `topology.md` -> https://docs.picodata.io/picodata/deploy/

It's obsolete anyway.

It's obsolete as we are not going to implement raft_applier fiber
anymore.

Use direct structure names instead of aliases
for better IDE code surfing

1

add roadmap-en

Tell a story.

It's already called `raft_conf_change_loop` in code.

Extend documentation with raft log processing algorithm.

Describe `conf_change_loop` and graceful shutdown logic.

Bring the algorithm description in accordance with actual
implementation. Also provide some comments to the code.