Update README.md

Change to dev portal link

Author: FabriceDautriat

README.md

@@ -4,7 +4,7 @@ Ledger Blue is not maintained anymore, but the app can still be compiled for thi
 
 This follows the beta specification at https://ledgerhq.github.io/btchip-doc/bitcoin-technical-beta.html - with the regular set of APDUs for standard wallet operations enabled.
 
-To compile and load it on a device, have a look here: https://ledger.readthedocs.io/en/latest/userspace/getting_started.html
+To compile and load it on a device, have a look here: https://developers.ledger.com/docs/nano-app/load/
 
 Can be tested quickly tested with the Python API at https://github.com/LedgerHQ/btchip-python and Electrum (force noPin = True in getClient in plugins/ledger/ledger.py)