Fix broken links on beta docs site (#1276)

* fix broken links and images

* llms

Author: eshaben

.ai/categories/basics.md

@@ -17,7 +17,8 @@ This guide explains the payout scheme, factors influencing rewards, and how mult
 
 The Polkadot ecosystem measures its reward cycles in a unit called an era. Kusama eras are approximately 6 hours long, and Polkadot eras are 24 hours long. At the end of each era, validators are paid proportionally to the amount of era points they have collected. Era points are reward points earned for payable actions like:
 
-- Issuing validity statements for [parachain blocks](/reference/parachains/blocks-transactions-fees/blocks/){target=\_blank}.
+- Issuing validity statements for parachain blocks.
+    
 - Producing a non-uncle block in the relay chain.
 - Producing a reference to a previously unreferenced uncle block.
 - Producing a referenced uncle block.

.ai/categories/dapps.md

@@ -26,8 +26,8 @@ In this guide, you'll learn how to:
 
 Before you begin, ensure you have:
 
-- A working [Polkadot SDK development environment](/parachains/launch-a-parachain/choose-a-template){target=\_blank}.
-- Basic understanding of [adding pallets to a runtime](/parachains/customize-runtime/add-a-pallet){target=\_blank}.
+- A working [Polkadot SDK development environment](/parachains/launch-a-parachain/set-up-the-parachain-template/){target=\_blank}.
+- Basic understanding of [adding pallets to a runtime](/parachains/customize-runtime/add-existing-pallets/){target=\_blank}.
 
 ## Understanding Instantiable Pallets