chore: the SSH aliases and CI's runner label keep the servers' names

The servers' names are no secret, so the settings that carry them stay
as they were, and nothing on a server or a laptop needs changing: CI
runs on `sahaquiel` again, the release uploads to `ramiel-fdroid`, and
deploys by hand go through `sahaquiel-deploy`. Prose still names a
server by the domain it serves, which says what a reader needs.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Tizian 「ティツィアーン」 <raisondetredev@pm.me>

deploy/backups.md

@@ -68,7 +68,7 @@ sudo apt install restic
 
 ### 3. The repository (deploy, on the server)
 
-As `deploy` (`ssh learn-deploy` on learn.halkyon.eu). A key without a passphrase,
+As `deploy` (`ssh sahaquiel-deploy` on learn.halkyon.eu). A key without a passphrase,
 since nobody is there to type it at 03:00:
 
 ```sh