chore: remove program ids as it vary between systems

Author: MarcosNicolau

examples/L2/.gitignore

@@ -0,0 +1,2 @@
+
+crates/l2/programs_ids.json

examples/L2/contracts/.env.holesky

@@ -1,8 +1,8 @@
 RPC_URL=https://ethereum-holesky-rpc.publicnode.com
 # Initial state root of db, see in crates/l2/db.rs
 INITIAL_STATE_ROOT=0x3c1d1c01f8e0a4533085bc9d8a3829c5f6872e6d6cf62e04ae71acbc803747ce
-# You can read it from crates/l2/programs_ids.json and generate it via make generate_program_id
-PROGRAM_ID=0x5961f68d41b2798f4dab05184d8f9cda39637d28097819906033c2f10b365ab1
+# You can read it from crates/l2/programs_ids.json and generate it via `make generate_program_id`
+PROGRAM_ID=<PROGRAM_ID>
 # Address of the wallet you want to set as owner
 OWNER_ADDRESS=<CONTRACT_OWNER_ADDRESS>
 # Private key used to deploy the contract