landing page: add example output

there are currently placeholder links to #examples. create this section and fill it in.

show the output of capa in many forms, including:
- default output
- vverbose output
- IDA explorer
- web explorer
- JSON
- protobuf

Maybe use a [carousel](https://getbootstrap.com/docs/5.3/components/carousel/#basic-examples) or details/summary element to keep the section from becoming 20 pages long. Also its ok to add another page and link to it.