git.rs: cleaning; render.rs: refactor to fit new git.rs library; test_render: initial commit; assets/*: update templates

Cargo.toml

@@ -7,6 +7,10 @@ edition = "2024"
 name = "frontend"
 path = "src/frontend.rs"
 
+[[bin]]
+name = "test_render"
+path = "src/test-render.rs"
+
 [dependencies]
 git2 = { version = "0.20.2", default-features = false }
 serde = { version = "1.0.219", default-features = false, features = ["derive"] }