Site reorg: Remove site/ subpath (#306)

Unfortunately, for proper package pathing, need to remove the `site/`
subpath. This includes:
- Moving everything back into root
- Adding a `copy-site.sh` script to copy resources into `mkdocs/site/`
before building the site with mkdocs.
- Also update examples to ensure all are loading the local sw.js / ui.js
- Consolidate examples in `docs/examples`
- Consolidate assets under src/assets/
- Move `favicons` to root
- Reformat and relint
- Tests: update playwright tests to use mkdocs output, add test for
embed in docs
- bump to 2.0.0-beta.2

tsconfig.json

@@ -29,7 +29,7 @@
     "incremental": true,
     "paths": {
       "flexsearch": ["./node_modules/@types/flexsearch"],
-      "~assets/*": ["./src/assets/*"],
+      "~assets/*": ["./src/assets/*"]
     }
   },
   "include": ["src/**/*.ts", "src/**/*.js", "src/**/*.d.ts"]