Update setup instructions (#254)
Update setup instructions (#254)

* Update setup instructions

- The commit hash was not compatible with recent versions of Bazel
- Update the dependency on skylib
- Add the load statement for `http_archive`, for easier copy-pasting
- Add an example of use (users shouldn't have to guess the load label)
- Update the version requirement (0.25.0 can't build the code)

* Remove example

bazelbuild/rules_rust,bazelbuild/rules_rust,bazelbuild/rules_rust,bazelbuild/rules_rust,bazelbuild/rules_rust