Merge pull request #1994 from Kobzol/cmd-parsing-manual

Use a manual parser for `@rust-timer` commands

Author: Kobzol

Cargo.lock

@@ -57,3 +57,6 @@ jemalloc-ctl = "0.5"
 serde = { workspace = true, features = ["derive"] }
 serde_json = { workspace = true }
 toml = "0.7"
+
+[dev-dependencies]
+insta = "1.40.0"

site/Cargo.toml

@@ -46,3 +46,8 @@ the `PORT` environment variable.
 ```console
 $ ./target/release/site <database>
 ```
+
+## Development
+We use [insta](https://github.com/mitsuhiko/insta) for snapshot testing. If any tests that use the
+`insta` macros fail, you should `cargo install cargo-insta` and then run `cargo insta review` to review
+the snapshot changes.