Update docs

docs/tut/crash-course/7-property-binding.md

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-# Property Binding
-
-Explicitly creating effects to update properties can become verbose when there
-are a lot of properties to update. Vide provides a way to *implicitly* create
-an effect to update properties on source update. This is also known as
-*property binding*, since changes to a source will automatically update the
-property.
-
-```lua
-local create = vide.create
-local source = vide.source
-
-local function Counter()
-    local count = source(0)
-
-    return create "TextButton" {
-        Text = function()
-            return "count: " .. count()
-        end,
-
-        Activated = function()
-            count(count() + 1)
-        end
-    }
-```
-
-This example is equivalent to the example seen on the previous page.
-
-Instead of explicitly creating an effect, assigning a (non-event) property
-a function will implicitly create a side-effect to update that property anytime
-a dependent source is updated.
-
-Just like effects, the function is ran immediately in a reactive scope to set
-the property initially and determine what sources are being depended on.
-
-This allows you as the programmer to not need to manually update UI as the state
-of your program changes. You just define how the data maps to UI, and Vide's
-reactive system will automatically update any properties depending on sources
-that are updated.
-
-## Children Binding
-
-Children can also be set in a similar manner.
-
-```lua
-local items = source {
-    create "TextLabel" { Text = "A" }
-}
-
-local function List(props: { children: () -> { Instance } })
-    return create "Frame" {
-        create "UIListLayout" {},
-        props.children
-    }
-end
-
-local list = List { children = items } -- creates a list with a single text label "A"
-
-items {
-    create "TextLabel" { Text = "B" },
-    create "TextLabel" { Text = "C" }
-}
-
--- this will automatically unparent the text label "A", and parent the labels "B" and "C".
-```