Adjust installation docs (#1010)

docs/modules/pkl-cli/pages/index.adoc

@@ -2,7 +2,6 @@
 include::ROOT:partial$component-attributes.adoc[]
 :uri-homebrew: https://brew.sh
 :uri-mise: https://mise.jdx.dev
-:uri-ubi: https://github.com/houseabsolute/ubi
 
 :uri-sonatype-snapshot-download: https://s01.oss.sonatype.org/service/local/artifact/maven/redirect?r=snapshots&g=org.pkl-lang&v={pkl-artifact-version}
 :uri-pkl-macos-amd64-download: {uri-sonatype-snapshot-download}&a=pkl-cli-macos-amd64&e=bin
@@ -89,7 +88,7 @@ endif::[]
 [[mise]]
 === Mise
 
-On macOS, Linux, and Windows, release versions can be installed using {uri-ubi}[the Universal Binary Installer (UBI)] with {uri-mise}[Mise].
+On macOS, Linux, and Windows, release versions can be installed with {uri-mise}[Mise].
 
 ifdef::is-release-version[]
 To install Pkl, run:
@@ -97,16 +96,16 @@ To install Pkl, run:
 [source,shell]
 [subs="+attributes"]
 ----
+# Install and activate Pkl globally
 mise use -g pkl@{pkl-version}
-----
 
-You can then run `mise use` to activate the latest version either globally or locally:
+# Install and activate Pkl locally
+mise use pkl@{pkl-version}
+----
+endif::[]
 
-[source,shell]
-----
-mise use -g ubi:apple/pkl@latest # Activate it globally
-mise use ubi:apple/pkl@latest
-----
+ifndef::is-release-version[]
+For instructions, switch to a release version of this page.
 endif::[]
 
 [[download]]