chore: modernize setup, dependencies, and project docs

wrangler-example.toml

@@ -1,6 +1,6 @@
 name = "email-to-rss"
 main = "src/index.ts"
-compatibility_date = "2024-09-23"
+compatibility_date = "REPLACE_WITH_COMPATIBILITY_DATE"
 compatibility_flags = ["nodejs_compat"]
 
 # Global KV Namespace bindings
@@ -30,4 +30,4 @@ routes = [
 ]
 
 [env.production.vars]
-DOMAIN = "REPLACE_WITH_YOUR_DOMAIN"
+DOMAIN = "REPLACE_WITH_YOUR_DOMAIN"