fix!: remove FooterSlot component

BREAKING CHANGE: the `FooterSlot` component will now be provided by `frontend-slot-footer`.

src/components/footer-slot/README.md

@@ -1,48 +0,0 @@
-# Footer Slot
-
-### Slot ID: `footer_slot`
-
-## Description
-
-This slot is used to replace/modify/hide the footer.
-
-## Example
-
-The following `env.config.jsx` will replace the default footer.
-
-![Screenshot of Default Footer](./images/default_footer.png)
-
-with a simple custom footer
-
-![Screenshot of Custom Footer](./images/custom_footer.png)
-
-```js
-import { DIRECT_PLUGIN, PLUGIN_OPERATIONS } from '@openedx/frontend-plugin-framework';
-
-const config = {
-  pluginSlots: {
-    footer_slot: {
-      plugins: [
-        {
-          // Hide the default footer
-          op: PLUGIN_OPERATIONS.Hide,
-          widgetId: 'default_contents',
-        },
-        {
-          // Insert a custom footer
-          op: PLUGIN_OPERATIONS.Insert,
-          widget: {
-            id: 'custom_footer',
-            type: DIRECT_PLUGIN,
-            RenderWidget: () => (
-              <h1 style={{textAlign: 'center'}}>🦶</h1>
-            ),
-          },
-        },
-      ]
-    }
-  },
-}
-
-export default config;
-```

src/components/footer-slot/index.jsx

@@ -1,11 +0,0 @@
-import React from 'react';
-import { PluginSlot } from '@openedx/frontend-plugin-framework';
-import Footer from '../Footer';
-
-const FooterSlot = () => (
-  <PluginSlot id="footer_slot">
-    <Footer />
-  </PluginSlot>
-);
-
-export default FooterSlot;

src/index.js

@@ -1,9 +1,8 @@
 import Footer, { EVENT_NAMES } from './components/Footer';
 import messages from './i18n/index';
 import StudioFooter from './components/studio-footer';
-import FooterSlot from './components/footer-slot';
 
 export default Footer;
 export {
-  messages, EVENT_NAMES, StudioFooter, FooterSlot,
+  messages, EVENT_NAMES, StudioFooter,
 };