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

pages/common/pixi-config.md

@@ -0,0 +1,28 @@
+# pixi config
+
+> Manage the configuration file.
+> More information: <https://pixi.sh/latest/reference/cli/#config>.
+
+- Edit the configuration file:
+
+`pixi config edit`
+
+- List all configurations:
+
+`pixi config list`
+
+- Prepend a value to a list configuration key:
+
+`pixi config prepend {{key}} {{value}}`
+
+- Append a value to a list configuration key:
+
+`pixi config append {{key}} {{value}}`
+
+- Set a configuration key to a value:
+
+`pixi config set {{key}} {{value}}`
+
+- Unset a configuration key:
+
+`pixi config unset {{key}}`