®️Mock NuChain requirements

// Some code

### Automated Part

Install `npm`. On Mac OS, you can run `brew install node`, which installs NodeJS and npm.

Make sure that `nuchain` is building and all tests are passing.

Start Docker with a memory allowance of at least 4 GB.

Run `./scripts/build-beta-distro.sh beta` to build nuchain-beta, or
run `./scripts/build-beta-distro.sh aws` to build nuchain-aws.
Then go get a coffee because it'll take a while.

When it's done, the script outputs the file `nuchain-beta-\<version number\>.tgz`
or `nuchain-aws-\<version number\>.tgz`. If the file is missing a version number,
add it to .tgz file created.