More prep work

crawlers/.gitignore

@@ -166,3 +166,4 @@ prod.env.ps1
 dev.env.ps1
 .venv
 .crawlers
+.secrets

crawlers/sample.env

@@ -1,3 +1,4 @@
+# Path to IPC socket to use for web3 connections
 export MOONSTREAM_IPC_PATH=null
 export MOONSTREAM_CRAWL_WORKERS=4
 export MOONSTREAM_DB_URI="postgresql://<username>:<password>@<db_host>:<db_port>/<db_name>"