feat: add effect cleanups, add docs (#2)

* docs: update readme

* feat: add cleanup function to effects

* refactor: move peek function to store module

* test: add nested atom check

* docs: add doc comments

* fix: `effect()` type

* refactor: remove divider comment

src/types.luau

@@ -1,13 +1,38 @@
 export type WeakMap<K, V> = typeof(setmetatable({} :: { [K]: V }, { __mode = "k" }))
 
+--[=[
+	A primitive state container that can be read from and written to. When the
+	state changes, all subscribers are notified.
+
+	@param state The next state or a function that produces the next state.
+	@return The current state, if no arguments are provided.
+]=]
 export type Atom<T> = (() -> T) & (state: T | (T) -> T) -> T
 
+--[=[
+	A function that depends on one or more atoms and produces a state. Can be
+	used to derive state from atoms.
+
+	@template State The type of the state.
+	@return The current state.
+]=]
 export type Molecule<T> = () -> T
 
+--[=[
+	Optional configuration for creating an atom.
+]=]
 export type AtomOptions<T> = {
+	--[=[
+		A function that determines whether the state has changed. By default,
+		a strict equality check (`===`) is used.
+	]=]
 	equals: (prev: T, next: T) -> boolean,
 }
 
+--[=[
+	A payload that can be sent from the server to the client to synchronize
+	state between the two.
+]=]
 export type SyncPayload = {
 	type: "patch" | "init",
 	data: { [any]: any },