docs(wm): border renames and aliases, ahk example

This commit renames a number of border-related code refs, removing the
ActiveWindow prefix since these borders are no longer just for the
active window.

Aliases have been added to preserve backwards compat for existing
configs.

An example AHK configuration file has been added to the Common Workflows
section of the docs site.

A link to the docs site has been added to the output of komorebic start.

A note has been added recommending that users disable system animations
for the best experience in the Getting Started guide.

docs/common-workflows/borders.md

@@ -0,0 +1,28 @@
+# Borders
+
+If you would like to add a visual border around both the currently focused window
+and unfocused windows ensure the following options are defined in the `komorebi.json`
+configuration file.
+
+```json
+{
+  "border": true,
+  "border_width": 8,
+  "border_offset": -1,
+  "border_style": "System",
+  "border_colours": {
+    "single": "#42a5f5",
+    "stack": "#00a542",
+    "monocle": "#ff3399",
+    "unfocused": "#808080"
+  }
+}
+```
+
+It is important to note that borders will only apply to windows managed by `komorebi`.
+
+This feature is not considered stable, and you may encounter visual artifacts
+from time to time.
+
+[![Watch the tutorial
+video](https://img.youtube.com/vi/7_9D22t7KK4/hqdefault.jpg)](https://www.youtube.com/watch?v=7_9D22t7KK4)