[Embeds] Embed for single post (#3450)

* add bskyembed vite app

* create build script (temp until embedr is ready)

* add build output to web build

* simplify post-build step by copying everything at once

* add simple post viewer

* add butterfly logo

* add vite plugin legacy

* proper error screen

* add image embed

* add url embed

* record embed + embedwithmedia

* add list+feed embeds

* add labeller embed (just to be safe)

* fix curatelist and modlist being the wrong way around

* Add PWI opt-out

* add favicon

* improve wording of PWI

* remove padding I used for screenshots

* add disabled state to embed

* improve PWI styles by adding an icon

* remove unused prop

* rm open proxy

* [Embeds] Add CTA and add general polish - input needed! (#3454)

* add CTA, colourful icons, and bigger logo

* make hover effect smaller + add to cta

* more responsive + preserve whitespace

* add trailing newsline to deploy script

* add repost indicator

* Make butterfly link to content

* More consistent error text wording

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Co-authored-by: Dan Abramov <dan.abramov@gmail.com>

bskyembed/src/utils.ts

@@ -0,0 +1,15 @@
+export function niceDate(date: number | string | Date) {
+  const d = new Date(date)
+  return `${d.toLocaleDateString('en-us', {
+    year: 'numeric',
+    month: 'short',
+    day: 'numeric',
+  })} at ${d.toLocaleTimeString(undefined, {
+    hour: 'numeric',
+    minute: '2-digit',
+  })}`
+}
+
+export function getRkey({uri}: {uri: string}): string {
+  return uri.split('/').pop() as string
+}