Use a placeholder host in the install instructions

The install snippets named one specific artifact repository by hostname.

- fetch the release zip from a placeholder host under the same tag-archive
  path shape

README.md

@@ -18,12 +18,13 @@ from.
 
 ## Install
 
-Each tag is published as a source zip to the `nvim-plugins` artifactapi repo,
-so arti-pack installs the same way as everything it manages:
+Each tag is published as a source zip under the same tag-archive path shape
+arti-pack expects, so it installs the same way as everything it manages —
+mirror it into your own artifact repository and fetch it from there:
 
 ```sh
 curl -fsSL -o /tmp/arti-pack.zip \
-  https://artifactapi.k8s.syd1.au.unkin.net/api/v2/remotes/nvim-plugins/files/unkin/arti-pack/archive/refs/tags/v0.1.0.zip
+  https://artifacts.example.com/artifactory/nvim-plugins/unkin/arti-pack/archive/refs/tags/v0.1.0.zip
 mkdir -p "${XDG_DATA_HOME:-$HOME/.local/share}/nvim/site/pack/arti-pack/start"
 unzip -q /tmp/arti-pack.zip -d /tmp/arti-pack
 mv /tmp/arti-pack/arti-pack-0.1.0 \
@@ -36,7 +37,7 @@ Once installed it can carry itself, since `url` bypasses the registry:
 {
   'unkin/arti-pack',
   tag = 'v0.1.0',
-  url = 'https://artifactapi.k8s.syd1.au.unkin.net/api/v2/remotes/nvim-plugins/files/unkin/arti-pack/archive/refs/tags/v0.1.0.zip',
+  url = 'https://artifacts.example.com/artifactory/nvim-plugins/unkin/arti-pack/archive/refs/tags/v0.1.0.zip',
 }
 ```