Opam description refers to examples

The opam description says:
```
A collection of bonsai_web examples. Bonsai is a library for building
reusable UI components inside an Incremental-style UI framework such as
Incr_dom or React. This repository contains its examples.
```

I believe it should have a note about components, not examples.

Start by locating the opam package metadata containing the quoted description. Update the wording so it refers to components rather than examples, while preserving the existing Bonsai context; done means the package description accurately describes bonsai_web_components.

Written by the indexing model from the issue text.