BREAKING CHANGE(web): Remove deprecated Header component #653

 ## Migration Guide

 ### HTML and CSS

The original `Header__*` classes no longer exist, and so does the
original structure.

Instead, new subcomponents replace the original nested classes.

The most notable change is that the mobile and desktop navigation
are now separate components that cannot be nested:

- `Header`
- `HeaderDialog`

Formerly, the desktop dialog (holding the site navigation) was
a responsive CSS modification of a shared HTML code. With the
new `Header` and `HeaderDialog`, each component has its own
instance of the navigation, i.e. the navigation code is duplicated.
This is because `HeaderDialog` will become an independent
component in the future.

You may need to take additional measures so your SEO is not
affected by the duplicate HTML code of the navigation.

While there are important changes also in the HTML structure,
the old class names in `Header` can be roughly mapped onto the
new subcomponents like this:

- `Header__mobileOnlyActions` → `HeaderMobileOnlyActions`
- `Header__bar` → removed without a replacement
- `Header__content` → removed without a replacement
- `Header__dialog` → `HeaderDialog`, stands outside of `Header`
- `Header__close` → removed without a replacement
- `Header__actions` → `HeaderDesktopOnlyActions`
- `Header__nav` → `HeaderNav`
- `Header__navItem` → `HeaderNavItem`
- `Header__link` → `HeaderLink`
- `Header__text` → removed without a replacement

Inside `HeaderDialog`:

- `Header__close` → `HeaderDialogCloseButton`
- `Header__actions` → `HeaderDialogActions`
- `Header__nav` → `HeaderDialogNav`
- `Header__navItem` → `HeaderDialogNavItem`
- `Header__link` → `HeaderDialogLink`
- `Header__text` → `HeaderDialogText`

 ### JavaScript

The deprecated `Header` JS plugin was removed in favour of the
`Offcanvas` plugin.

- `import { Header } from '@lmc-eu/spirit-web'` → `import { Offcanvas } from '@lmc-eu/spirit-web'`
- `data-toggle="header"` → `data-spirit-toggle="offcanvas"`
(`spirit` infix is made mandatory in PR #935)
- `data-dismiss="header"` → `data-spirit-dismiss="offcanvas"`
(`spirit` infix is made mandatory in PR #935)

---

Please refer back to these instructions or reach out to our team
if you encounter any issues during migration.

packages/web/src/js/index.esm.ts

@@ -3,7 +3,6 @@ export { default as BaseComponent } from './BaseComponent';
 export { default as Collapse } from './Collapse';
 export { default as Dropdown } from './Dropdown';
 export { default as FileUploader } from './FileUploader';
-export { default as Header } from './Header';
 export { default as Modal } from './Modal';
 export { default as Offcanvas } from './Offcanvas';
 export { default as Password } from './Password';

packages/web/src/js/index.umd.ts

@@ -3,7 +3,6 @@ import BaseComponent from './BaseComponent';
 import Collapse from './Collapse';
 import Dropdown from './Dropdown';
 import FileUploader from './FileUploader';
-import Header from './Header';
 import Modal from './Modal';
 import Offcanvas from './Offcanvas';
 import Password from './Password';
@@ -20,7 +19,6 @@ export default {
  Collapse,
  Dropdown,
  FileUploader,
- Header,
  Modal,
  Offcanvas,
  Password,