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

tests/embed/sandbox/index.html

@@ -1,22 +1,24 @@
 <!doctype html>
 <html>
-<head>
-<style>
-html, body {
-  width: 100%;
-  height: 100%;
-}
-iframe {
-  border: 1px black solid;
-  display: flex;
-  width: 90%;
-  height: 600px;
-}
-</style>
-</head>
-<body>
-
-<iframe src="http://localhost:8020/index-sandbox.html" sandbox="allow-scripts allow-modals allow-forms allow-same-origin allow-downloads"></iframe>
-
-</body>
+  <head>
+    <style>
+      html,
+      body {
+        width: 100%;
+        height: 100%;
+      }
+      iframe {
+        border: 1px black solid;
+        display: flex;
+        width: 90%;
+        height: 600px;
+      }
+    </style>
+  </head>
+  <body>
+    <iframe
+      src="http://localhost:8020/index-sandbox.html"
+      sandbox="allow-scripts allow-modals allow-forms allow-same-origin allow-downloads"
+    ></iframe>
+  </body>
 </html>