chore: update documentation URLs to use workspace setting

Replace all docs.rs documentation URLs with documentation.workspace = true
to inherit from the workspace's docs.pezkuwichain.io URL.

bizinikiwi/deprecated/hashing/Cargo.toml

@@ -7,7 +7,7 @@ license = "Apache-2.0"
 homepage.workspace = true
 repository.workspace = true
 description = "Hashing primitives (deprecated: use pezsp-crypto-hashing for new applications)"
-documentation = "https://docs.rs/pezsp-crypto-hashing"
+documentation.workspace = true
 
 [badges]
 maintenance = { status = "deprecated" }

bizinikiwi/deprecated/hashing/proc-macro/Cargo.toml

@@ -7,7 +7,7 @@ license = "Apache-2.0"
 homepage.workspace = true
 repository.workspace = true
 description = "Procedural macros for calculating static hashes (deprecated in favor of `pezsp-crypto-hashing-proc-macro`)."
-documentation = "https://docs.rs/pezsp-crypto-hashing-proc-macro"
+documentation.workspace = true
 
 [badges]
 maintenance = { status = "deprecated" }