fix: contract verification url paths

Author: nijoe1

SUMMARY.md

@@ -132,11 +132,11 @@
   - [Filecoin.sol](smart-contracts/developing-contracts/filecoin.sol.md)
   - [Direct deal-making with Client contract](smart-contracts/developing-contracts/client-contract-tutorial.md)
   - [Using RaaS](smart-contracts/developing-contracts/using-raas.md)
-  - [Verify a contract](smart-contracts/developing-contracts/verify-a-contract/index.md)
-    - [Programmatic](smart-contracts/developing-contracts/verify-a-contract/programmatic/index.md)
+  - [Verify a contract](smart-contracts/developing-contracts/verify-a-contract/verify-a-contract.md)
+    - [Programmatic](smart-contracts/developing-contracts/verify-a-contract/programmatic/programmatic.md)
       - [Hardhat](smart-contracts/developing-contracts/verify-a-contract/programmatic/hardhat.md)
       - [Foundry](smart-contracts/developing-contracts/verify-a-contract/programmatic/foundry.md)
-    - [Web Interface](smart-contracts/developing-contracts/verify-a-contract/web-interface/index.md)
+    - [Web Interface](smart-contracts/developing-contracts/verify-a-contract/web-interface/web-interface.md)
       - [Blockscout](smart-contracts/developing-contracts/verify-a-contract/web-interface/blockscout.md)
       - [Filfox](smart-contracts/developing-contracts/verify-a-contract/web-interface/filfox.md)
   - [Best practices](smart-contracts/developing-contracts/best-practices.md)