rename polkadot-collator to polkadot-parachain (#1241)

* rename polkadot-collator to polkadot-parachain

Not every node has to be a collator.

* Update README.md

Co-authored-by: Chevdor <chevdor@users.noreply.github.com>

* rename docker file

* Update .github/workflows/extrinsic-ordering-check-from-bin.yml

Co-authored-by: Chevdor <chevdor@users.noreply.github.com>

* Versioning scheme that tracks polkadot relay chain

but allows for patch releases by having a 0 at the end.
(`-patch1` patch naming schemes were discussed but they
were judged to cause downstream packagers pain.)

* update name

* update lock file

Co-authored-by: Chevdor <chevdor@users.noreply.github.com>

cumulus/scripts/create_seedling_spec.sh

@@ -26,7 +26,7 @@ sudo=$8
 [ -z "$para_$id" ] && usage
 [ -z "$sudo" ] && usage
 
-binary="./target/release/polkadot-collator"
+binary="./target/release/polkadot-parachain"
 
 # build the chain spec we'll manipulate
 $binary build-spec --disable-default-bootnode --chain seedling > seedling-spec-plain.json