fix: fix dead links (#843)

* Update README.md

* Update typescript/packages/legacy/x402/README.md

Co-authored-by: phdargen <pdargent@icloud.com>

---------

Co-authored-by: phdargen <pdargent@icloud.com>

Author: andrewshab3

typescript/packages/legacy/x402/README.md

@@ -55,6 +55,6 @@ If you're not using our `x402-fetch` or `x402-axios` packages, you can manually
    - The `Access-Control-Expose-Headers` field set to `"X-PAYMENT-RESPONSE"` to receive the server's transaction response
 
 For implementation examples, we recommend reviewing our official client packages:
-- [x402-fetch implementation](https://github.com/coinbase/x402/blob/main/typescript/packages/x402-fetch/src/index.ts)
-- [x402-axios implementation](https://github.com/coinbase/x402/blob/main/typescript/packages/x402-axios/src/index.ts)
+- [x402-fetch implementation](https://github.com/coinbase/x402/tree/main/typescript/packages/legacy/x402-fetch)
+- [x402-axios implementation](https://github.com/coinbase/x402/tree/main/typescript/packages/legacy/x402-axios)