message: Move old version documentation to docs section in readme
diff: @@ -30,12 +30,6 @@ npm i @material-ui/pickers
  yarn add @material-ui/pickers
  ```
  -Old versions documentation:
  -
  -| Version | Documentation url |
  -| --------- | ------- |
  -| v2 | https://material-ui-pickers-v2.dmtr-kovalenko.now.sh/ |
  -
  Now choose the library that pickers will use to work with date. We are providing interfaces for [moment](https://momentjs.com/), [luxon](https://moment.github.io/luxon/), [dayjs](https://github.com/iamkun/dayjs) and [date-fns v2](https://date-fns.org/). If you are not using moment in the project (or dont have it in the bundle already) we suggest using date-fns or luxon, because they are much lighter and will be correctly tree-shaked from the bundle. Note, that we are fully relying on [date-io](https://github.com/dmtrKovalenko/date-io) for supporting different libraries.
  ```sh
  @@ -71,6 +65,12 @@ render(<App />, document.querySelector('#app'));
  Check out the [documentation website](https://material-ui-pickers.dev/)
  +Old versions documentation:
  +
  +| Version | Documentation url |
  +| ------- | ----------------------------------------------------- |
  +| v2 | https://material-ui-pickers-v2.dmtr-kovalenko.now.sh/ |
  +
  ### Recently updated?
  Changelog available [here](https://github.com/mui-org/material-ui-pickers/releases)
  