chore: add proper documentation (#763)

* chore: generate API ref using `typedoc`

* chore: declutter readme and add links to ytjs.dev

* chore: clean up

docs/api/namespaces/Helpers/functions/observe.md

@@ -0,0 +1,24 @@
+[youtubei.js](../../../README.md) / [Helpers](../README.md) / observe
+
+# Function: observe()
+
+> **observe**\<`T`\>(`obj`): [`ObservedArray`](../type-aliases/ObservedArray.md)\<`T`\>
+
+Creates a trap to intercept property access
+and add utilities to an object.
+
+## Type Parameters
+
+• **T** *extends* [`YTNode`](../classes/YTNode.md)
+
+## Parameters
+
+• **obj**: `T`[]
+
+## Returns
+
+[`ObservedArray`](../type-aliases/ObservedArray.md)\<`T`\>
+
+## Defined in
+
+[src/parser/helpers.ts:394](https://github.com/LuanRT/YouTube.js/blob/eb21af33db708f0355f4fb15881f5d4fabc7b06c/src/parser/helpers.ts#L394)