Docs migration register options (#8850)

* Change tabs from area samples to buttons to switch to be in line with other samples, change linewith of extra line datasets to default instead of 1 to be in line with all other lines in the sampels

* add link to all available import sample in the migration guide

docs/getting-started/v3-migration.md

@@ -20,7 +20,7 @@ Chart.js 3.0 introduces a number of breaking changes. Chart.js 2.0 was released
 * Chart.js is no longer providing the `Chart.bundle.js` and `Chart.bundle.min.js`. Please see the [installation](installation.md) and [integration](integration.md) docs for details on the recommended way to setup Chart.js if you were using these builds.
 * `moment` is no longer specified as an npm dependency. If you are using the `time` or `timeseries` scales, you must include one of [the available adapters](https://github.com/chartjs/awesome#adapters) and corresponding date library. You no longer need to exclude moment from your build.
 * The `Chart` constructor will throw an error if the canvas/context provided is already in use
-* Chart.js 3 is tree-shakeable. So if you are using it as an `npm` module in a project and want to make use of this feature, you need to import and register the controllers, elements, scales and plugins you want to use. You will not have to call `register` if importing Chart.js via a `script` tag or from the [`auto`](integration.md#bundlers-webpack-rollup-etc) register path as an `npm` module, in this case you will not get the tree shaking benefits. Here is an example of registering components:
+* Chart.js 3 is tree-shakeable. So if you are using it as an `npm` module in a project and want to make use of this feature, you need to import and register the controllers, elements, scales and plugins you want to use, for a list of all the available items to import see [integration](integration.md#bundlers-webpack-rollup-etc). You will not have to call `register` if importing Chart.js via a `script` tag or from the [`auto`](integration.md#bundlers-webpack-rollup-etc) register path as an `npm` module, in this case you will not get the tree shaking benefits. Here is an example of registering components:
 
 ```javascript
 import { Chart, LineController, LineElement, PointElement, LinearScale, Title } from `chart.js`