ESBuild Plugin: Setup and usage docs. (#14720)

* Prep readme for Typedoc. Clean up metadata.

* Add license.

* Ignore generated readme.

* Flesh out TypeDoc.

* Flesh out copy, usage.

* web: Update package-lock.

web/packages/esbuild-plugin-live-reload/client/ESBuildObserver.js

@@ -28,6 +28,8 @@ const log = console.debug.bind(console, logPrefix);
  * ```
  *
  * @implements {Disposable}
+ * @category Plugin
+ * runtime browser
  */
 export class ESBuildObserver extends EventSource {
     /**