Add infinite scroll example

[blittle]

HOW to test your changes?

1. Make sure to npm install && npm run build at the root.
2. Start the app: cd examples/infinite-scroll && npm run dev
3. Navigate to a collection: http://localhost:3000/collections/men
4. Scroll down the page, and make sure that new products automatically load.

Post-merge steps

Checklist

• I've read the Contributing Guidelines
• I've considered possible cross-platform impacts (Mac, Linux, Windows)
• I've added a changeset if this PR contains user-facing or noteworthy changes
• I've added tests to cover my changes
• I've added or updated the documentation

[michenly]

Suggested change

	## Instructions
	### 1. Link your store to inject the required environment variables
	```bash
	h2 link
	```
	### 2. Edit the route loader
	In `app/routes/collections.$handle.tsx`, update the `pageBy` parameter passed to the `getPaginationVariables` function call to customize how many products to load at a time.
	```ts
	const paginationVariables = getPaginationVariables(request, {
	pageBy: 8,
	});
	```
	## Instructions (optional)
	### 1. Link your store to inject the required environment variables
	```bash
	h2 link

2. Change number of products load at once

In app/routes/collections.$handle.tsx, update the pageBy parameter passed to the getPaginationVariables function call to customize how many products to load at a time.

const paginationVariables = getPaginationVariables(request, {
  pageBy: 8,
});

[blittle]

Honestly, I'm thinking both of the steps are optional 🤔

[michenly]

🎩 and the example looks great :)

[benjaminsehl]

Couple optional suggestions but this looks awesome

[benjaminsehl]

We could make this an optional step, as Mock Shop only has 23 products (@michenly 's comment on this was deleted when I was writing this reply)

[michenly]

@blittle I just merged my other example that re-order all example to be alphabetical so there are some conflicts. Hope those wont ever happen again now things are in order thou 🙏

[juanpprieto]

nit: missing the new emoji

[blittle]

It's not new though, it's just modified 🤔