Improve crate metadata used on crates.io (#325)

* Updates crate descriptions now that we have several crates.
* Adjusts `repository` for the ancillary crates to deep link to their
  directory in the monorepo, rather than the repository root. This may
  help with tools like Dependabot, which parse these URLs to find out
  whether a dependency exists in a subdirectory or not.
* Adds explicit `documentation` links since otherwise docs links are
   missing from search results, due to rust-lang/crates.io#1484.
* Adds `keywords` for all user-facing crates (ie everything but the
  proc-macros crate, since that isn't really buildpacks/CNB specific).

Author: edmorley

README.md

@@ -9,7 +9,7 @@
 [Rustc Version 1.56+]: https://img.shields.io/badge/rustc-1.56+-lightgray.svg
 [rustc]: https://blog.rust-lang.org/2021/10/21/Rust-1.56.0.html
 
-`libcnb.rs` is a Rust framework for writing [Cloud Native Buildpacks](https://buildpacks.io) in Rust. It is an opinionated implementation adding language constructs and convenience methods for working with the spec. It values strong adherence to the spec and data formats.
+`libcnb.rs` is a framework for writing [Cloud Native Buildpacks](https://buildpacks.io) in Rust. It is an opinionated implementation adding language constructs and convenience methods for working with the spec. It values strong adherence to the spec and data formats.
 
 It currently targets version `0.6` of the CNB spec.
 

libcnb-cargo/Cargo.toml

@@ -5,7 +5,9 @@ edition = "2021"
 rust-version = "1.56"
 license = "BSD-3-Clause"
 description = "Cargo command for managing buildpacks written with libcnb.rs"
-repository = "https://github.com/Malax/libcnb.rs"
+keywords = ["buildpacks", "CNB"]
+repository = "https://github.com/Malax/libcnb.rs/tree/main/libcnb-cargo"
+documentation = "https://docs.rs/libcnb-cargo"
 readme = "README.md"
 include = ["src/**/*", "../LICENSE", "README.md"]
 

libcnb-data/Cargo.toml

@@ -4,8 +4,9 @@ version = "0.4.0"
 edition = "2021"
 rust-version = "1.56"
 license = "BSD-3-Clause"
-description = "Rust language binding of the Cloud Native Buildpack spec."
-repository = "https://github.com/Malax/libcnb.rs"
+description = "Types for data formats specified in the Cloud Native Buildpack specification, used by libcnb.rs"
+keywords = ["buildpacks", "CNB"]
+repository = "https://github.com/Malax/libcnb.rs/tree/main/libcnb-data"
 documentation = "https://docs.rs/libcnb-data"
 readme = "../README.md"
 include = ["src/**/*", "../LICENSE", "../README.md"]

libcnb-proc-macros/Cargo.toml

@@ -5,7 +5,8 @@ edition = "2021"
 rust-version = "1.56"
 license = "BSD-3-Clause"
 description = "Procedural macros used within libcnb.rs"
-repository = "https://github.com/Malax/libcnb.rs"
+repository = "https://github.com/Malax/libcnb.rs/tree/main/libcnb-proc-macros"
+documentation = "https://docs.rs/libcnb-proc-macros"
 readme = "../README.md"
 include = ["src/**/*", "../LICENSE", "../README.md"]
 

libcnb-test/Cargo.toml

@@ -5,7 +5,9 @@ edition = "2021"
 rust-version = "1.56"
 license = "BSD-3-Clause"
 description = "An integration testing framework for buildpacks written with libcnb.rs"
-repository = "https://github.com/Malax/libcnb.rs"
+keywords = ["buildpacks", "CNB"]
+repository = "https://github.com/Malax/libcnb.rs/tree/main/libcnb-test"
+documentation = "https://docs.rs/libcnb-test"
 readme = "README.md"
 include = ["src/**/*", "../LICENSE", "README.md"]
 

libcnb/Cargo.toml

@@ -4,7 +4,8 @@ version = "0.5.0"
 edition = "2021"
 rust-version = "1.56"
 license = "BSD-3-Clause"
-description = "Rust language binding of the Cloud Native Buildpack spec."
+description = "A framework for writing Cloud Native Buildpacks in Rust"
+keywords = ["buildpacks", "CNB"]
 repository = "https://github.com/Malax/libcnb.rs"
 documentation = "https://docs.rs/libcnb"
 readme = "../README.md"