Add guide for adding an existing pallet (#1113)

* add guide for adding an existing pallet

* update content

* apply feedback and formatting

* llms

* update links

* fix wording and llms

---------

Co-authored-by: Erin Shaben <[email protected]>

Author: brunopgalvao

.ai/categories/basics.md

@@ -559,12 +559,12 @@ Launch your parachain locally and start producing blocks:
 
     - Utility pallet
 
-        ![](/images/parachains/customize-runtime/pallet-development/add-pallet-to-runtime/add-pallets-to-runtime-1.webp)
+        ![](/images/parachains/customize-runtime/pallet-development/add-pallet-to-runtime/add-pallets-to-runtime-01.webp)
 
 
     - Custom pallet
 
-        ![](/images/parachains/customize-runtime/pallet-development/add-pallet-to-runtime/add-pallets-to-runtime-2.webp)
+        ![](/images/parachains/customize-runtime/pallet-development/add-pallet-to-runtime/add-pallets-to-runtime-02.webp)
 
 ## Where to Go Next
 

.ai/categories/dapps.md

@@ -560,12 +560,12 @@ Launch your parachain locally and start producing blocks:
 
     - Utility pallet
 
-        ![](/images/parachains/customize-runtime/pallet-development/add-pallet-to-runtime/add-pallets-to-runtime-1.webp)
+        ![](/images/parachains/customize-runtime/pallet-development/add-pallet-to-runtime/add-pallets-to-runtime-01.webp)
 
 
     - Custom pallet
 
-        ![](/images/parachains/customize-runtime/pallet-development/add-pallet-to-runtime/add-pallets-to-runtime-2.webp)
+        ![](/images/parachains/customize-runtime/pallet-development/add-pallet-to-runtime/add-pallets-to-runtime-02.webp)
 
 ## Where to Go Next
 

.ai/categories/infrastructure.md

@@ -560,12 +560,12 @@ Launch your parachain locally and start producing blocks:
 
     - Utility pallet
 
-        ![](/images/parachains/customize-runtime/pallet-development/add-pallet-to-runtime/add-pallets-to-runtime-1.webp)
+        ![](/images/parachains/customize-runtime/pallet-development/add-pallet-to-runtime/add-pallets-to-runtime-01.webp)
 
 
     - Custom pallet
 
-        ![](/images/parachains/customize-runtime/pallet-development/add-pallet-to-runtime/add-pallets-to-runtime-2.webp)
+        ![](/images/parachains/customize-runtime/pallet-development/add-pallet-to-runtime/add-pallets-to-runtime-02.webp)
 
 ## Where to Go Next
 

.ai/categories/networks.md

@@ -560,12 +560,12 @@ Launch your parachain locally and start producing blocks:
 
     - Utility pallet
 
-        ![](/images/parachains/customize-runtime/pallet-development/add-pallet-to-runtime/add-pallets-to-runtime-1.webp)
+        ![](/images/parachains/customize-runtime/pallet-development/add-pallet-to-runtime/add-pallets-to-runtime-01.webp)
 
 
     - Custom pallet
 
-        ![](/images/parachains/customize-runtime/pallet-development/add-pallet-to-runtime/add-pallets-to-runtime-2.webp)
+        ![](/images/parachains/customize-runtime/pallet-development/add-pallet-to-runtime/add-pallets-to-runtime-02.webp)
 
 ## Where to Go Next
 

.ai/categories/parachains.md

@@ -560,12 +560,12 @@ Launch your parachain locally and start producing blocks:
 
     - Utility pallet
 
-        ![](/images/parachains/customize-runtime/pallet-development/add-pallet-to-runtime/add-pallets-to-runtime-1.webp)
+        ![](/images/parachains/customize-runtime/pallet-development/add-pallet-to-runtime/add-pallets-to-runtime-01.webp)
 
 
     - Custom pallet
 
-        ![](/images/parachains/customize-runtime/pallet-development/add-pallet-to-runtime/add-pallets-to-runtime-2.webp)
+        ![](/images/parachains/customize-runtime/pallet-development/add-pallet-to-runtime/add-pallets-to-runtime-02.webp)
 
 ## Where to Go Next
 

.ai/categories/polkadot-protocol.md

@@ -560,12 +560,12 @@ Launch your parachain locally and start producing blocks:
 
     - Utility pallet
 
-        ![](/images/parachains/customize-runtime/pallet-development/add-pallet-to-runtime/add-pallets-to-runtime-1.webp)
+        ![](/images/parachains/customize-runtime/pallet-development/add-pallet-to-runtime/add-pallets-to-runtime-01.webp)
 
 
     - Custom pallet
 
-        ![](/images/parachains/customize-runtime/pallet-development/add-pallet-to-runtime/add-pallets-to-runtime-2.webp)
+        ![](/images/parachains/customize-runtime/pallet-development/add-pallet-to-runtime/add-pallets-to-runtime-02.webp)
 
 ## Where to Go Next
 

.ai/categories/smart-contracts.md

@@ -560,12 +560,12 @@ Launch your parachain locally and start producing blocks:
 
     - Utility pallet
 
-        ![](/images/parachains/customize-runtime/pallet-development/add-pallet-to-runtime/add-pallets-to-runtime-1.webp)
+        ![](/images/parachains/customize-runtime/pallet-development/add-pallet-to-runtime/add-pallets-to-runtime-01.webp)
 
 
     - Custom pallet
 
-        ![](/images/parachains/customize-runtime/pallet-development/add-pallet-to-runtime/add-pallets-to-runtime-2.webp)
+        ![](/images/parachains/customize-runtime/pallet-development/add-pallet-to-runtime/add-pallets-to-runtime-02.webp)
 
 ## Where to Go Next