doc: better naming the example

doc: add code example for rip.Handle

use rip.Route as the unit for the Router

The Router can't handle entities as it can't handle multiple typed
routes. Therefore, only the handler, the path and the OpenAPI schema
can be typeless and handled by the Router as is.

remove struct tag

update documentation for page/page_size

trying new Go documentation link

delete Entity interface

Major change. Now any type should do for an EntityProvider.
ID will just be simple strings.

It removes a lot of dependencies from rip when implementing a service.

add html codec documentation

add some documentation

move codec wrapper utils into the codecwrap package

fixes #10