license / docs pass:

- add new docs for loading, exploring, sharing, embedding, and offline usage
- add license file / license banner

electron app:
- for now, don't bundle docs, open in native browser

embeds:
- support 'embed' option, 'replayonly' or 'full' (default if no url)

ui:
- display package.json version in info menu

package.json:
- update scripts to match README
- move electron entrypoint into extraMetadata
- add scripts for packaging as module

README: minor edits

docs/offline.md

@@ -0,0 +1,41 @@
+---
+layout: default
+title: Offline Use
+nav_order: 4
+parent: Usage
+permalink: /docs/offline
+---
+
+# Offline Use
+
+ReplayWeb.page is available for offline use in several ways.
+
+## ReplayWeb.page Offline Cache
+
+After ReplayWeb.page is loaded, it can automatically be used offline without requiring an internet connection.
+
+If a connection is not available, all web archive already loaded will continue to be available.
+
+[Loading local archives](loading#loading-local-web-archives) should fully work without an internet connection.
+
+## ReplayWeb.page as Progress Web App
+
+ReplayWeb.page can also be installed as [Progressive Web App](https://developer.mozilla.org/en-US/docs/Web/Progressive_web_apps) and be available as a standalone app on desktop and mobile.
+
+This is still experimental, but should provide the same behavior as regular https://replayweb.page/
+
+## ReplayWeb.page as Standalone Desktop (Electron) App
+
+ReplayWeb.page is also available as a standalone Electron App. In this mode, ReplayWeb.page
+ships its own version of Chrome.
+
+Although the Web Page/Progressive Web App versions have almost the same features, the standalone App is useful for two primary reasons:
+
+1) For viewing web archives that contain Flash. Flash is not supported by default in most browsers and will soon be removed. The ReplayWeb.page App will bundle a Flash plugin to continue to make Flash accessible for web archives.
+
+2) Primary use for viewing offline web archive. If your primary use is to view web archives stored locally,
+the ReplayWeb.page App is a better option, as it provides direct access to the file system.
+Once loaded, ReplayWeb.page App can continue to load web archives from disk.
+The desktop app fully replaces [Webrecorder Player](https://github.com/webrecorder/webrecorder-player)
+
+When using [https://replayweb.page](https://replayweb.page), you may be asked to re-open a local file because a web site can not have persistent access to your file system.