docs(readme): improve layout a bit

README.md

@@ -1,10 +1,12 @@
-# rPGP: OpenPGP implemented in pure Rust, permissively licensed 
+# rPGP
+
+> OpenPGP implemented in pure Rust, permissively licensed 
 
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 rPGP is the only full Rust implementation of OpenPGP, following [RFC4880](https://tools.ietf.org/html/rfc4880.html) and [RFC2440](https://tools.ietf.org/html/rfc2440). It offers a minimal low-level API and does not prescribe trust schemes or key management policies. It fully supports all functionality required by the [Autocrypt 1.1 e-mail encryption specification](https://autocrypt.org/level1.html). 
 
-rPGP is regularly published as [the PGP Crate](https://docs.rs/pgp/) and its RSA implementation 
+rPGP is regularly published as [the `pgp` Crate](https://crates.io/crates/pgp/) and its [RSA](https://crates.io/crates/rsa) implementation 
 lives under the collective [RustCrypto umbrella](https://github.com/RustCrypto/RSA).
 For ECC crypto support we are using [Curve25519-dalek](https://crates.io/crates/curve25519-dalek).