Add Uninstall Document (#733)

Author: jriddle-linode

wiki/Uninstallation.md

@@ -0,0 +1,13 @@
+# Uninstallation
+
+## PyPi
+
+```bash
+pip3 uninstall linode-cli
+```
+
+If you would like to remove the config file (easy to re-create) you must do so manually.
+
+```bash
+rm $HOME/.config/linode-cli
+```

wiki/_Sidebar.md

@@ -1,4 +1,5 @@
 - [Installation](./Installation)
+- [Uninstallation](./Uninstallation)
 - [Configuration](./Configuration)
 - [Usage](./Usage)
 - [Output](./Output)
@@ -7,4 +8,4 @@
   - [Overview](./Development%20-%20Overview)
   - [Skeleton](./Development%20-%20Skeleton)
   - [Setup](./Development%20-%20Setup)
-  - [Testing](./Development%20-%20Testing)
+  - [Testing](./Development%20-%20Testing)