feat: deprecated docs

docs/plugin-usage.md

@@ -1,78 +0,0 @@
-# Plugin usage
-
-If you want your plugin to be opened in a modal, then use open UI:
-
-```ts
-penpot.ui.open('Plugin name', '/app.html', {
-  width: 500,
-  height: 600,
-});
-```
-
-Get state:
-
-```ts
-// file file state
-penpot.ui.getFileState();
-
-// file page state
-penpot.ui.getPageState();
-
-// selection id
-penpot.ui.getSelection();
-
-// current theme (dark/light)
-penpot.ui.getTheme();
-```
-
-### Messages
-
-Receive message from iframe:
-
-```ts
-penpot.ui.onMessage((message) => {
-  console.log('Received message:', message);
-});
-```
-
-Send message from iframe:
-
-```ts
-parent.postMessage({ content: 'text' }, '*');
-```
-
-Send message from plugin
-
-```ts
-penpot.ui.sendMessage({ type: 'hello' });
-```
-
-Send message from plugin:
-
-```ts
-window.addEventListener('message', function (event) {
-  console.log('Message received from plugin: ', event.data);
-});
-```
-
-### Events
-
-Current events `pagechange`, `filechange`,`selectionchange` and `themechange`.
-
-```ts
-const event = (page) => {
-  console.log(page.name);
-};
-
-penpot.on('pagechange', event);
-
-penpot.off('pagechange', event);
-```
-
-### Requests
-
-Same as the browser fetch API.
-
-```ts
-penpot.fetch('http://example.com/movies.json');
-```