Fix links in `Cargo.toml`s

Cargo.toml

@@ -3,8 +3,8 @@ name = "ark-r1cs-std"
 version = "0.1.0"
 authors = [ "arkworks contributors" ]
 description = "A standard library for constraint system gadgets"
-homepage = "https://arworks.rs"
-repository = "https://github.com/arkworks/r1cs-gadgets"
+homepage = "https://arkworks.rs"
+repository = "https://github.com/arkworks-rs/r1cs-std"
 documentation = "https://docs.rs/ark-r1cs-std/"
 keywords = ["zero knowledge", "cryptography", "zkSNARK", "SNARK", "r1cs"]
 categories = ["cryptography"]