Update docs

docs/tut/crash-course/11-actions.md

@@ -1,56 +0,0 @@
-# Actions
-
-Actions in Vide are special callbacks that you can pass along with properties,
-which will be called when those properties are being processed with the instance
-being assigned to, allowing you to run custom code.
-
-```lua
-local action = vide.action
-```
-
-```lua
-create "TextLabel" {
-    Text = "test",
-
-    action(function(instance)
-        print(instance.Text)
-    end)
-}
-
--- will print "test"
-```
-
-Actions can be wrapped with functions to re-use specific behaviors. Below is
-an example of an action used to listen for property changes:
-
-```lua
-local action = vide.action
-local cleanup = vide.cleanup
-
-local function changed(property: string, callback: (new) -> ())
-    return action(function(instance)
-        local con = instance:GetPropertyChangedSignal(property):Connect(function()
-            callback(instance[property])
-        end)
-
-        -- remember to clean up the connection when the reactive scope the action
-        -- is ran in is destroyed, so the instance can be garbage collected
-        cleanup(function()
-            con:Disconnect()
-        end)
-    end)
-end
-
-local output = source ""
-
-local instance = create "TextBox" {
-    changed("Text", output)
-}
-
-instance.Text = "foo"
-
-print(output()) -- "foo"
-```
-
-The source `output` will be updated with the new property value any time it is
-changed externally.