Serverless Stack

Just downloaded and tested SST last night.
Liking it a lot so far.
Noticed some small updates with the docs that can help first time devs/ops

In Getting Started
```# Deploy to prod
npm deploy --stage prod```
to
```# Deploy to prod
npm run deploy -- --stage prod```

In Intro, replace all
```npm run deploy --stage prod```
with
```npm run deploy -- --stage prod```
same with `npm run remove --stage prod`

thanks <@U03H6K65S3S>, they are updated, will be pushed today.

Thanks <@U02H0KUJFH7>, I saw your PR. Let’s try using `npx` everywhere. So instead of
```npm deploy --stage prod```
do
```npx sst deploy --stage prod```