Resolve "allow to have plugins without panel"

Closes #306 (closed)

docs/plugins/plugins.md

@@ -11,6 +11,7 @@ Your plugin should utilize the `window.minerva.plugins.registerPlugin` method fo
   pluginName: string;
   pluginVersion: string;
   pluginUrl: string;
+  withoutPanel: boolean | undefined;
 }
 ```
 
@@ -21,6 +22,7 @@ window.minerva.plugins.registerPlugin({
   pluginName: 'Your Plugin Name',
   pluginVersion: '1.8.3',
   pluginUrl: 'https://example.com/plugins/plugin.js',
+  withoutPanel: false,
 });
 ```
 
@@ -28,17 +30,17 @@ window.minerva.plugins.registerPlugin({
 
 The `window.minerva.plugins.registerPlugin` method returns object with `element` property which is a DOM element, allowing your plugin to append its HTML content to the DOM. Use this element to create and modify the HTML structure of your plugin.
 
-```
+```javascript
 // Plugin registration
 const { element } = window.minerva.plugins.registerPlugin({
-  pluginName: "Your Plugin Name",
-  pluginVersion: "1.0.0",
-  pluginUrl: "your-plugin-url",
+  pluginName: 'Your Plugin Name',
+  pluginVersion: '1.0.0',
+  pluginUrl: 'your-plugin-url',
 });
 
 // Modify plugin's HTML structure
 const yourContent = document.createElement('div');
-yourContent.textContent = "Your Plugin Content";
+yourContent.textContent = 'Your Plugin Content';
 element.appendChild(yourContent);
 ```