Moved xp_version to a separate file

INSTALL.md

@@ -54,7 +54,7 @@ For other OSes, please see [Goreleaser](https://goreleaser.com).
 ## Releasing a new version
 
 1. Ensure [release notes](docs%2Freleases.adoc) are updated (for a feature release)
-1. Change value of `:xp_version:` variable in the [installation guide](docs%2Finstall.adoc) to `X.Y.Z` (version of the upcoming release)
+1. Change value of `:xp_version:` variable in the [variables file](docs%2variables.adoc) to `X.Y.Z` (version of the upcoming release)
 1. Commit all the uncommitted changes. Make sure HEAD is not in dirty state (no uncommitted changes).
 1. Run `git tag vX.Y.Z`
 1. Run `git push origin vX.Y.Z` to trigger the release via Github actions.

docs/install.adoc

@@ -1,4 +1,4 @@
-:xp_version: 2.6.0
+include::variables.adoc[]
 
 = Install, upgrade or uninstall Enonic CLI
 

docs/usage.adoc

@@ -1,3 +1,4 @@
+include::variables.adoc[]
 = Getting started with Enonic CLI
 
 Once installed, the CLI includes standard CLI help functions for listing available commands and options.
@@ -8,7 +9,7 @@ To get a list of commands, simply type the following in your terminal:
 The feedback will contain available commands and options:
 
 ----
-Enonic CLI v.2.7.0
+Enonic CLI v{xp_version}
 Manage XP instances, home folders and projects
 
 USAGE:

docs/variables.adoc

@@ -0,0 +1 @@
+:xp_version: 2.8.0