misc fixes:

- import from '@webrecorder/wabac' package for sw.js, though using github overrides for now
- replay: show loading spinner on beforeunload event in iframe
- embed: support passing basePageUrl param as part of extraConfig for custom top-level page

package.json

@@ -9,7 +9,7 @@
   "license": "AGPL-3.0-or-later",
   "dependencies": {
     "@fortawesome/fontawesome-free": "^5.13.0",
-    "@webrecorder/wabac": "github:https://github.com/webrecorder/wabac.js#master",
+    "@webrecorder/wabac": "github:https://github.com/webrecorder/wabac.js",
     "bulma": "^0.8.2",
     "flexsearch": "^0.6.32",
     "keyword-mark-element": "^0.1.2",
@@ -17,8 +17,7 @@
     "marked": "^1.0.0",
     "mime-types": "^2.1.27",
     "pretty-bytes": "^5.3.0",
-    "register-service-worker": "^1.7.1",
-    "wabac": "github:https://github.com/webrecorder/wabac.js#master"
+    "register-service-worker": "^1.7.1"
   },
   "devDependencies": {
     "css-loader": "^3.5.3",