pixi, pixi-{config,global,project,task}: add page (#13249)

pages/common/pixi-task.md

@@ -0,0 +1,20 @@
+# pixi task
+
+> Manage tasks in the project environment.
+> More information: <https://pixi.sh/latest/reference/cli/#task>.
+
+- Create a new task:
+
+`pixi task add {{task_name}} {{task_command}}`
+
+- List all tasks in the project:
+
+`pixi task list`
+
+- Remove a task:
+
+`pixi task remove {{task_name}}`
+
+- Create an alias for a task:
+
+`pixi task alias {{alias_name}} {{task1 task2 ...}}`