[DOC] doc: update a lot of the documentation

doc/readme.md

@@ -1,17 +1,14 @@
 # Odoo Web Library Documentation
 
-Currently, this repository contains:
 
-- an implementation/extension of the QWeb template engine that outputs a virtual
-  dom (using the snabbdom library)
-- a Component class, which uses the QWeb engine as its underlying rendering
-  mechanism. The component class is designed to be declarative, with
-  asynchronous rendering. Also, it uses snabbdom as the virtual dom library.
-- some utility functions/classes
-- a Store class and a connect function, to help manage the state of an application (like react-redux)
+## Reference
 
-- [Quick Start](quick_start.md)
-- [Tutorial](tutorial.md)
 - [Component](component.md)
 - [QWeb](qweb.md)
-- [State Management](state_management.md)
+- [Store](store.md)
+- [Observer](observer.md)
+- [Virtual DOM](vdom.md)
+
+## Miscellaneous
+- [Quick Start](quick_start.md)
+- [Comparison with React/Vue](comparison.md)