docs: Update sidebar and payment guides for clarity and organization

- Added a new sidebar link for "How to Pay the Executions" to enhance navigation.
- Revised the "How to Pay the Executions" guide to streamline payment methods and clarify steps for using RLC tokens and vouchers.
- Removed outdated guides related to Web3Mail and Web3Telegram payment methods to reduce redundancy and improve focus on current documentation.
- Updated references in the SDK documentation to point to the revised payment guide for better user guidance.

Author: Le-Caignec

.vitepress/sidebar.ts

@@ -240,6 +240,10 @@ export function getSidebar() {
             text: '🚀 Getting Started',
             link: '/guides/use-iapp/getting-started',
           },
+          {
+            text: 'How to Pay the Executions',
+            link: '/guides/use-iapp/how-to-pay-executions',
+          },
           {
             text: 'Run iApp with ProtectedData',
             link: '/guides/use-iapp/run-iapp-with-ProtectedData',
@@ -248,32 +252,6 @@ export function getSidebar() {
             text: 'Run iApp without ProtectedData',
             link: '/guides/use-iapp/run-iapp-without-ProtectedData',
           },
-          {
-            text: 'How to Pay the Executions',
-            link: '/guides/use-iapp/how-to-pay-executions',
-          },
-          {
-            text: '💰 How to Pay',
-            collapsed: true,
-            items: [
-              {
-                text: 'How to Pay for Web3Mail',
-                link: '/guides/use-iapp/how-to-pay/how-to-pay-for-web3mail',
-              },
-              {
-                text: 'How to Pay for Web3Telegram',
-                link: '/guides/use-iapp/how-to-pay/how-to-pay-for-web3telegram',
-              },
-              {
-                text: 'Pricing Considerations',
-                link: '/guides/use-iapp/how-to-pay/pricing-considerations',
-              },
-              {
-                text: 'Voucher',
-                link: '/guides/use-iapp/how-to-pay/voucher',
-              },
-            ],
-          },
         ],
       },
     ],