charmhub pages don't use markdown for metadata description field

[Tom Haddon]

For the atlantis operator I have the following in my metadata.yaml:

```
description: |
  A charm providing Terraform pull request automation using [Atlantis](https://www.runatlantis.io/).

  When PRs are generated against a Terraform config repository this charm can be configured to listen for a webhook which then triggers it to run `terraform plan` and post that to the PR. Reviewers can then post a message that will trigger this service to apply the changes if appropriate.

  Improve your Terraform workflow, making it easier for devops teams to collaborate on infrastructure changes.

  This charm is useful for teams wanting to automate their Terraform workflows.
```

However, the display has no newlines, doesn't include a link or pre-formatted text.

[Tom Haddon (mthaddon)]

(Fwiw, I'm filing a bug here because the "Contribute > Report a Bug" link from the charmhub page brings me here)

[Juan M. Tirado (tiradojm)]

We have to figure out who is responsible for this issue. The juju team does not have control over this entries in the charmhub page.