replace dead cryptopp.com link with archive

Author: tobtoht

content/_guides/wallet_files.md

@@ -40,7 +40,7 @@ This file is used to distinguish wallets on different networks from eachother.
 
 ## Encryption
 
-The keys and cache files are encrypted using the [chacha20 stream cipher](https://www.cryptopp.com/wiki/ChaCha20). The KDF to generate the encryption key from the wallet password is 𝒄𝒓𝒚𝒑𝒕𝒐𝒏𝒊𝒈𝒉𝒕, a memory hard hash function that was used in Monero's proof-of-work before RandomX.
+The keys and cache files are encrypted using the [chacha20 stream cipher](https://web.archive.org/web/20240606185144/https://www.cryptopp.com/wiki/ChaCha20). The KDF to generate the encryption key from the wallet password is 𝒄𝒓𝒚𝒑𝒕𝒐𝒏𝒊𝒈𝒉𝒕, a memory hard hash function that was used in Monero's proof-of-work before RandomX.
 
 >The 𝒄𝒓𝒚𝒑𝒕𝒐𝒏𝒊𝒈𝒉𝒕 hash operates by first using Keccak 1600,
 >the 1600 bit variant of the Keccak hash used in SHA-3, to create a 200 byte
@@ -60,4 +60,4 @@ A modern CPU takes about 30-40 ms to run the KDF on a single core using the refe
 
 ## Compatibility with other wallets
 
-Wallet files are generally compatible with other Monero wallets. Meaning, you can create a wallet with the CLI or GUI and open it in Feather or vice versa. However, compatibility issues may occur if the the underlying wallet implementation versions differ too much. Before opening a wallet file in a different client, make sure both clients are up to date.
+Wallet files are generally compatible with other Monero wallets. Meaning, you can create a wallet with the CLI or GUI and open it in Feather or vice versa. However, compatibility issues may occur if the the underlying wallet implementation versions differ too much. Before opening a wallet file in a different client, make sure both clients are up to date.