docs: stub bulk of missing extension docs

docs/latest/extensions/modules/panel.md

@@ -1,3 +1,34 @@
 # Module: Panel
 
 ...
+
+```js
+import MyComponent from './MyComponent.js';
+
+export default {
+  id: 'example-panel-module',
+
+  /**
+   * @param {object} params
+   * @param {object} params.servicesManager
+   */
+  getPanelModule({ servicesManager }) {
+    return {
+      menuOptions: [
+        {
+          icon: 'list',
+          label: 'Magic',
+          target: 'target-component-id',
+        },
+      ],
+      components: [
+        {
+          id: 'target-component-id',
+          component: MyComponent,
+        },
+      ],
+      defaultContext: ['VIEWER'],
+    };
+  },
+};
+```

docs/latest/extensions/modules/sop-class-handler.md

@@ -1,3 +1,36 @@
 # Module: SOP Class Handler
 
 ...
+
+```js
+const SOP_CLASS_UIDS = {
+  BASIC_TEXT_SR: '1.2.840.10008.5.1.4.1.1.88.11',
+  ENHANCED_SR: '1.2.840.10008.5.1.4.1.1.88.22',
+};
+
+const sopClassHandlerModule = {
+  id: 'OHIFDicomHtmlSopClassHandler',
+  sopClassUids: Object.values(SOP_CLASS_UIDS),
+
+  /**
+   * @param {object} series -
+   * @param {object} study -
+   * @param {object} dicomWebClient -
+   * @param {object} authorizationHeaders -
+   */
+  getDisplaySetFromSeries(series, study, dicomWebClient, authorizationHeaders) {
+    const instance = series.getFirstInstance();
+
+    return {
+      plugin: 'html',
+      displaySetInstanceUid: 0,
+      wadoRoot: study.getData().wadoRoot,
+      wadoUri: instance.getData().wadouri,
+      sopInstanceUid: instance.getSOPInstanceUID(),
+      seriesInstanceUid: series.getSeriesInstanceUID(),
+      studyInstanceUid: study.getStudyInstanceUID(),
+      authorizationHeaders,
+    };
+  },
+};
+```

docs/latest/viewer/index.md

@@ -1 +1,9 @@
 # Viewer
+
+The OHIF Viewing Platform strives to be highly configurable and extensible. This
+makes it easier for our community members to keep their "secret sauce" private,
+and incentivises contributions back to the platform. The `@ohif/viewer` project
+of the platform is the lynchpin that combines everything to create our
+application.
+
+- When configuration and themeing aren't enough