documentation: Remove references to wormholenetwork.com

[johnsaigle]

The correct website is now https://wormhole.com/docs/, and the original one is actually flagged as malicious (in my browser anyway).

~/c/wormhole ((325cca4b))> rg 'wormholenetwork.com'
spydk/js/package.json
5:  "homepage": "https://wormholenetwork.com",

CONTRIBUTING.md
120:[Wormhole Network](https://wormholenetwork.com).

sdk/vaa/structs.go
393:    // More details here: https://docs.wormholenetwork.com/wormhole/vaas

README.md
3:This monorepo contains the reference implementation of the [Wormhole protocol](https://wormholenetwork.com).
9:See [Live Contracts](https://docs.wormholenetwork.com/wormhole/contracts) for current testnet and mainnet deployments of

sdk/js/README.md
10:[Wormhole](https://wormholenetwork.com/) allows for the transmission of arbitrary data across multiple blockchains. For the currently supported chains and contracts visit [the docs](https://docs.wormholenetwork.com/wormhole/contracts)