gh-alias: add page (#5125)

* gh-alias: add page

* Apply suggestions from code review

Co-authored-by: bl-ue <54780737+bl-ue@users.noreply.github.com>

* rename shortcut to alias

Co-authored-by: bl-ue <54780737+bl-ue@users.noreply.github.com>

pages/common/gh-alias.md

@@ -0,0 +1,24 @@
+# gh alias
+
+> Manage GitHub CLI command aliases from the command line.
+> More information: <https://cli.github.com/manual/gh_alias>.
+
+- Display the subcommand help:
+
+`gh alias`
+
+- List all of the aliases `gh` is configured to use:
+
+`gh alias list`
+
+- Create a `gh` subcommand alias:
+
+`gh alias set {{pv}} '{{pr view}}`
+
+- Set a shell command as a `gh` subcommand:
+
+`gh alias set --shell {{alias_name}} {{command}}`
+
+- Delete a command shortcut:
+
+`gh alias delete {{alias_name}}`