docs/api: link libvcs docs directly

Author: tony

docs/api/index.md

@@ -3,7 +3,7 @@
 # API Reference
 
 :::{seealso}
-For granular control see {ref}`libvcs <libvcs:index>`'s {ref}`Commands <libvcs:cmd>` and {ref}`Projects <libvcs:projects>`.
+For granular control see the [libvcs documentation](https://libvcs.git-pull.com/en/latest/)—especially the sections on [commands](https://libvcs.git-pull.com/en/latest/usage/commands.html) and [projects](https://libvcs.git-pull.com/en/latest/usage/projects.html).
 :::
 
 ## Internals