Replace `polkadot-launch` content with parachain-launch & zombinet

[nuke-web3]

Motivation

launch is going away

We need to replace polkadot-launch throughout the docs, there is better tooling now, some community maintained and generally better UX tool to test things out in a similar fashion.

https://github.com/open-web3-stack/parachain-launch

• asses if zero docker knowledge is needed, we don't want to have users need anything but the ability to run commands as instructed to get things working and iterating on.
• ensure running against local binaries is possible and document here and upstream
  • If very simple, perhaps make a local image (would require and extra how-to on building docker images for any substrate project)

https://github.com/paritytech/zombienet

https://hackmd.io/uJHjSDhvQICEvm87m9970A

Considerations

• Replace or add new config files to the parachain template that is AFAIK unmaintained.

[brunopgalvao]

This is great that we are moving in favor of Zombienet. One update I would suggest would be to modify instructions on creating Docker images in respective repos (polkadot, cumulus) to add the --platform=linux/amd64 flag so that these instructions are compatible with M1 chips. So the whole script would look something like:

cumulus (https://github.com/paritytech/cumulus#build--launch-rococo-collators)

$ docker run --rm -it -w /shellhere/cumulus \
                    -v $(pwd):/shellhere/cumulus \
                    --platform=linux/amd64 paritytech/ci-linux:production cargo build --release --locked -p polkadot-parachain
sudo chown -R $(id -u):$(id -g) target/

polkadot (https://github.com/paritytech/polkadot#build-from-source-with-docker)

git checkout <latest tagged release>
docker run --rm -it -w /shellhere/polkadot \
                    -v $(pwd):/shellhere/polkadot \
                    --platform=linux/amd64 paritytech/ci-linux:production cargo build --release
sudo chown -R $(id -u):$(id -g) target/

[brunopgalvao]

Created a PR on Cumulus: paritytech/cumulus#1336

[brunopgalvao]

Here is a working config for Zombienet with 4 validators, "rockmine" common goods chain, and contracts parachain. This config uses local binaries and is working:

[relaychain]
default_command = "./polkadot"
default_args = [ "-lparachain=debug" ]

chain = "rococo-local"

  [[relaychain.nodes]]
  name = "alice"
  validator = true

  [[relaychain.nodes]]
  name = "bob"
  validator = true

  [[relaychain.nodes]]
  name = "charlie"
  validator = true

  [[relaychain.nodes]]
  name = "dave"
  validator = true

[[parachains]]
id = 1000
cumulus_based = true
chain="statemine-local"

  [parachains.collator]
  name = "statemine-local"
  command = "./polkadot-parachain-rockmine"
  args = ["-lparachain=debug"]

[[parachains]]
id = 1002
cumulus_based = true
chain="contracts-rococo-dev"

  [parachains.collator]
  name = "contracts"
  command = "./polkadot-parachain"
  args = ["-lparachain=debug"]

For the polkadot-parachain-rockmine binary, I had to find and replace instances of kusama in the chainspec.rs file with rococo.