New homepage (#861)

* Paste button

* Logo and animated blobs

* Predictable initial blob position

* Initial blob shape

* Update canvas on resize if not updating every frame

* lol

* Get styles from CSS

* Background blobs

* Fade into the center

* Get initial focus

* Pause time while page is hidden

* Footer

* Optimise amount of initial CSS

* More CSS optimisation

* Install button

* Home page with demo loading

* Tweak size

* Replace thumbnails

* Responsive demo section

* Responsive main section

* Remove debug stuff

* Fix prerender SVG size

* Changes from feedback

* Blob nudges (#872)

* more smaller blobs

* less blobs that are practically invisible

* more dynamic speed range and stronger gravity

* Reverting resize observer change

The content rect is different to getBoundingClientRect

Co-authored-by: Adam Argyle <atom@argyleink.com>

src/client/missing-types.d.ts

@@ -11,7 +11,7 @@
  * limitations under the License.
  */
 /// <reference path="../../missing-types.d.ts" />
-/// <reference path="../shared/initial-app/Intro/missing-types.d.ts" />
+/// <reference path="../shared/prerendered-app/Intro/missing-types.d.ts" />
 
 interface Navigator {
   readonly standalone: boolean;
@@ -25,23 +25,3 @@ declare module 'service-worker:*' {
 }
 
 declare module 'preact/debug' {}
-
-interface ResizeObserverCallback {
-  (entries: ResizeObserverEntry[], observer: ResizeObserver): void;
-}
-
-interface ResizeObserverEntry {
-  readonly target: Element;
-  readonly contentRect: DOMRectReadOnly;
-}
-
-interface ResizeObserver {
-  observe(target: Element): void;
-  unobserve(target: Element): void;
-  disconnect(): void;
-}
-
-declare var ResizeObserver: {
-  prototype: ResizeObserver;
-  new (callback: ResizeObserverCallback): ResizeObserver;
-};