Add .npmrc to .gitignore to use public npm for @cloudflare packages

Author: sidharthachatterjee

.gitignore

@@ -57,4 +57,7 @@ terraform.tfvars
 test/e2e/.dev.vars
 
 # Temporary e2e wrangler configs
-.wrangler-e2e-*.jsonc
+.wrangler-e2e-*.jsonc
+
+# npm config
+.npmrc