improve typescript and linting usage across codebase

add ts-lit-plugin and eslint-typescript

disable no-invalid-css rule

fix a bunch of errors raised by eslint and typescript

run prettier & eslint on the remaining files

remove unused imports

split coll-index into index and info components...
and rename "coll" -> "item" for these.
also includes some fixes for previously-undocumented properties used on
non-ts elements.

extract labeled fields into separate component...
and make a few type improvements too

swap custom copy button for shoelace one

rename a few more missed things

embed.html

@@ -1,15 +1,18 @@
 <html>
-<head>
-<script src="ui.js"></script>
-<style>
-body {
-  background-color: lightgrey;
-}
-</style>
-</head>
-<body>
-
-<replay-web-page replaybase="./" embed="replay-with-info" src="./docs/assets/tweet-example.wacz" url="page:0"></replay-web-page>
-
-</body>
+  <head>
+    <script src="ui.js"></script>
+    <style>
+      body {
+        background-color: lightgrey;
+      }
+    </style>
+  </head>
+  <body>
+    <replay-web-page
+      replaybase="./"
+      embed="replay-with-info"
+      src="./docs/assets/tweet-example.wacz"
+      url="page:0"
+    ></replay-web-page>
+  </body>
 </html>