Archive crates

Move git-commit, git-trailers, and link-git to an archived directory
to hide them away -- showing the intent that radicle-git-ext will be
the main crate for git functionality.

Signed-off-by: Fintan Halpenny <fintan.halpenny@gmail.com>
X-Clacks-Overhead: GNU Terry Pratchett

archived/git-commit/Cargo.toml

@@ -0,0 +1,19 @@
+[package]
+name = "git-commit"
+version = "0.3.0"
+license = "MIT OR Apache-2.0"
+edition = "2021"
+authors = [
+  "Alexis Sellier <alexis@radicle.xyz>",
+  "Fintan Halpenny <fintan.halpenny@gmail.com>",
+]
+description = "A small library for parsing, displaying and creating a git commit"
+keywords = ["git", "git-commit", "git-trailers", "radicle"]
+
+[dependencies]
+thiserror = "1"
+
+[dependencies.git2]
+version = "0.16.1"
+default-features = false
+features = ["vendored-libgit2"]