add mol mut docs

app/docs/demo.meta.tree

@@ -88,6 +88,7 @@ include \/mol/list/demo
 include \/mol/list/demo/table
 include \/mol/list/demo/tree
 include \/mol/map/yandex/demo
+include \/mol/mutable/demo
 include \/hyoo/marked/demo
 include \/hyoo/harp/demo
 - include \/mol/message/demo

mutable/demo/demo.view.tree

@@ -0,0 +1,14 @@
+$mol_mutable_demo $mol_example_code
+	code? \
+		\const person = [777, {id: '10', name: 'Jhon'}, false]
+		\
+		\const mut = $mol_mutable(person)
+		\mut[1].id(v => '42')
+		\mut().push('Online')
+		\mut[1].name(() => 'Dave')
+		\mut[2]((v) => !v)
+		\
+		\const next = mut()
+	aspects /
+		\Muttable
+		\Array