docs(readme): Be a bit more minimal in the README

The dev workflow is fairly common.

The description is relatively redundant.

The big seller is the screenshot.  Maybe we add a slice of code at some
point.

Author: epage

README.md

@@ -6,22 +6,6 @@
 [![documentation](https://img.shields.io/badge/docs-master-blue.svg)][Documentation]
 ![build status](https://github.com/rust-lang/annotate-snippets-rs/actions/workflows/ci.yml/badge.svg)
 
-The library helps visualize meta information annotating source code slices.
-It takes a data structure called `Snippet` on the input and produces a `String`
-which may look like this:
-
 ![Screenshot](./examples/expected_type.svg)
 
-Local Development
------------------
-
-```console
-$ cargo build
-$ cargo test
-```
-
-When submitting a PR please use  [`cargo fmt`][] (nightly).
-
-[`cargo fmt`]: https://github.com/rust-lang/rustfmt
-
 [Documentation]: https://docs.rs/annotate-snippets/