Move 'Set Custom Gas Limits' page to same menu level as 'Generate Random Numbers' (#777)

- Moved set-custom-gas-limits.mdx from pages/entropy/generate-random-numbers/ to pages/entropy/
- Updated pages/entropy/_meta.json to include 'Set Custom Gas Limits' in How-To Guides section
- Removed entry from pages/entropy/generate-random-numbers/_meta.json
- Navigation now shows 'Set Custom Gas Limits' at same level as 'Generate Random Numbers'

Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Co-authored-by: Jayant <[email protected]>

Author: devin-ai-integration[bot]

pages/entropy/_meta.json

@@ -24,6 +24,7 @@
   },
 
   "generate-random-numbers": "Generate Random Numbers",
+  "set-custom-gas-limits": "Set Custom Gas Limits",
   "debug-callback-failures": "Debug Callback Failures",
 
   "-- Reference Material": {

pages/entropy/generate-random-numbers/_meta.json

@@ -1,4 +1,3 @@
 {
-  "evm": "in EVM contracts",
-  "set-custom-gas-limits": "Set Custom Gas Limits"
+  "evm": "in EVM contracts"
 }