chore(brubeck-migration-script): [ETH-885] Remove subpackage (#1007)

Migration should have completed long time ago, so no need for this
anymore?

Author: teogeb

.gitignore

@@ -1,8 +1,6 @@
 **node_modules/
 **build
 **cache
-/packages/brubeck-migration-script/artifacts
-/packages/brubeck-migration-script/typechain
 /packages/tatum-thegraph-subgraph/artifacts
 /packages/tatum-thegraph-subgraph/cache
 /packages/tatum-thegraph-subgraph/generated

README.md

@@ -10,4 +10,3 @@ This is a monorepo containing various smart contracts and subgraphs used by the
 ## Other packages
 
 - [chainlink-ens-external-adapter](https://github.com/streamr-dev/network-contracts/tree/master/packages/chainlink-ens-external-adapter) Custom Chainlink job that implements an ENS oracle used to verify ENS ownership on mainnet when creating streams
-- [brubeck-migration-script](https://github.com/streamr-dev/network-contracts/tree/master/packages/brubeck-migration-script) Script that migrates opted-in streams from Corea to Brubeck network

package.json

@@ -25,9 +25,7 @@
     "graph2_copyInfo": "./scripts/copyAbis.sh && ./scripts/generateYaml.sh",
     "graph3_build": "npm run doAll --workspace=network-subgraphs",
     "graph": "npm run graph1_build && npm run graph2_copyInfo && npm run graph3_build",
-    "e2etest": "npm run e2etest --workspace=network-contracts",
-    "migration-build": "npm run build -w=brubeck-migration-script",
-    "migration-run": "npm run migration -w=brubeck-migration-script"
+    "e2etest": "npm run e2etest --workspace=network-contracts"
   },
   "devDependencies": {
     "@chainsafe/ssz": "^0.10.2",