Add build information to migration guide

pages/developers/migration-guides/4-to-5.md

@@ -7,13 +7,43 @@ grand_parent: Developers
 
 # Migration guide - 4.x to 5.0
 
-dash.js version 5.0 introduces changes to the settings and the APIs. This guide will help you migrate your application
-from dash.js version 4.x to 5.0.
+dash.js version 5.0 introduces changes to the build files, settings and the APIs. This guide will help you migrate your
+application from dash.js version 4.x to 5.0.
 
 ## Breaking changes
 
 This section lists the breaking changes that you must consider when migrating from dash.js version 4.x to 5.0.
 
+### Build
+
+With version 5 of dash.js we introduced three different bundle formats:
+
+* `UMD legacy`: A `UMD` build targeting legacy platforms by specifying the babel target  `ie: '11'`. In addition,
+  `core.js` polyfills are enabled.
+* `ESM modern`: An `ESM` build using `.browserslistrc` as target, with target set to `defaults`. **No** `core.js`
+  polyfills are enabled.
+* `UMD modern`:  A `UMD` build targeting modern platforms using `.browserslistrc` as target, with target set to
+  `defaults`. **No** `core.js` polyfills are enabled.
+
+All the bundled files are located in the `dist` directory of the repository. The `legacy` folder inside the `dist`
+folder contains the `UMD legacy` build. The `modern` folder inside the `dist` folder contains both the `ESM modern` and
+the `UMD modern` build.
+
+The following entry points are defined in the `package.json`:
+
+````json
+{
+  "types": "./index.d.ts",
+  "import": "./dist/modern/esm/dash.all.min.js",
+  "default": "./dist/modern/esm/dash.all.min.js",
+  "browser": "./dist/modern/umd/dash.all.min.js",
+  "script": "./dist/modern/umd/dash.all.min.js",
+  "require": "./dist/modern/umd/dash.all.min.js"
+}
+````
+
+More information about installation and building can be found [here](../../quickstart/installation.html).
+
 ### Settings
 
 #### ABR Rules
@@ -31,8 +61,8 @@ Moreover, a new `throughput` sub-section was added to the `abr` section of the s
 you to specify the throughput calculation mode and fine tune sample and EWMA settings.
 
 Since these changes are quite extensive we can not provide a direct one-to-one mapping in table format. Please refer to
-the detailed [ABR settings](../../advanced/abr/settings.html),
-the [throughput settings](../../advanced/abr/throughput-calculation.html) and make yourself familiar with the
+the detailed [ABR settings](../../usage/abr/settings.html),
+the [throughput settings](../../usage/abr/throughput-calculation.html) and make yourself familiar with the
 new [settings structure](https://github.com/Dash-Industry-Forum/dash.js/blob/development/src/core/Settings.js).
 
 #### Buffer Target
@@ -42,7 +72,7 @@ the buffer target for the top quality and long form content:
 
 | v4                 | v5                  | Description                                                                          |
 |:-------------------|:--------------------|:-------------------------------------------------------------------------------------|
-| `stableBufferTime` | `bufferTimeDefault` | See [Buffer Management](../../advanced/buffer-management.html) for more information. |
+| `stableBufferTime` | `bufferTimeDefault` | See [Buffer Management](../../usage/buffer-management.html) for more information. |
 
 #### changeType()
 
@@ -71,7 +101,7 @@ current selected Representation for a specific media type such as `video` or `au
 
 The method `setQualityFor()` has been removed instead use `setRepresentationForTypeById()` or
 `setRepresentationForTypeByIndex()`. A detailed description of how to switch qualities can be
-found [here](../../advanced/abr/manual-quality-selection.html).
+found [here](../../usage/abr/manual-quality-selection.html).
 
 | v4              | v5                                                                  | Description                                                           |
 |:----------------|:--------------------------------------------------------------------|:----------------------------------------------------------------------|
@@ -101,7 +131,7 @@ attribute `bitrateInKbit`.
 
 The method `getDVRWindowSize` has been removed, use `getDvrWindow()` instead. A detailed explanation of how to get
 information about the
-DVR window can be found [here](../../advanced/timing-apis.html#playback-time).
+DVR window can be found [here](../../usage/timing-apis.html#playback-time).
 
 | v4                   | v5               | Description                                                                                               |
 |:---------------------|:-----------------|:----------------------------------------------------------------------------------------------------------|
@@ -159,7 +189,7 @@ start of the DVR window. Internally `DVRWindow.start` is added to the provided v
 method
 uses absolute presentation timestamp.
 
-A more detailed explanation can be found [here](../../advanced/timing-apis.html#seeking).
+A more detailed explanation can be found [here](../../usage/timing-apis.html#seeking).
 
 | v4          | v5                       | Description                                                                                                                                                                                                                                                                                     |
 |:------------|:-------------------------|:------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|