refactor(docs): streamline iApp documentation by unifying references and enhancing clarity in usage guides

Author: Le-Caignec

src/guides/build-iapp/build-&-test.md

@@ -164,8 +164,7 @@ The CLI will build a Docker image, run your app, and show you the results:
 
 ## Next Steps
 
-- When everything is ready
-  [deploy and run your iApp](/guides/use-iapp/run-iapp-with-ProtectedData)
+- When everything is ready [deploy and run your iApp](/guides/use-iapp/run-iapp)
 
 <script setup>
 import CLIDemo from '@/components/CLIDemo.vue';

src/guides/use-iapp/getting-started.md

@@ -71,9 +71,8 @@ the Build iApp section.
 
 For step-by-step instructions, check out these guides:
 
-- **[Run iApp without ProtectedData](/guides/use-iapp/run-iapp-without-ProtectedData)** -
-  iExec CLI, lib, and other execution methods
-- **[Run iApp with ProtectedData](/guides/use-iapp/run-iapp-with-ProtectedData)** -
-  How to provide data and parameters to iApp
+- **[Run iApp](/guides/use-iapp/run-iapp)** - Learn how to run an iApp with
+  various input types including protected data, arguments, input files, and
+  secrets
 - **[How to Pay for Executions](/guides/use-iapp/how-to-pay-executions)** -
   Understanding costs and payment options

src/guides/use-iapp/how-to-pay-executions.md

@@ -54,9 +54,8 @@ await iexec.account.deposit(1_000_000_000); // Deposit 1 RLC
 ```
 
 Now you are ready to run a task on the iExec Protocol and pay for it. See our
-guide on
-[running iApp with ProtectedData](/guides/use-iapp/run-iapp-with-ProtectedData.md)
-for detailed execution steps.
+guide on [running iApp](/guides/use-iapp/run-iapp.md) for detailed execution
+steps.
 
 ## Paying with Vouchers <ChainNotSupportedBadge />
 
@@ -231,10 +230,7 @@ parameters is 0, which means only free resources are accepted.
 
 Now that you understand payment methods:
 
-- Learn about
-  [Run iApp with ProtectedData](/guides/use-iapp/run-iapp-with-ProtectedData)
-- Learn about
-  [Run iApp without ProtectedData](/guides/use-iapp/run-iapp-without-ProtectedData)
+- Learn about [Run iApp](/guides/use-iapp/run-iapp)
 
 <script setup>
 import ChainNotSupportedBadge from '@/components/ChainNotSupportedBadge.vue'