[erinecon]

Overview

Update the linking in the how-to index page.

Rationale

Failing workflow (example) has caught that the links in the index page are wrong. Since the index page lives in docs/how-to, the linking in that page should not contain how-to.

This PR fixes the issues so that the workflow passes. Thanks to @yanksyoon for reporting!

Juju Events Changes

None

Module Changes

None

Library Changes

None

Checklist

• The charm style guide was applied.
• The contributing guide was applied.
• The changes are compliant with ISD054 - Managing Charm Complexity
• The documentation for charmhub is updated.
• The PR is tagged with appropriate label (urgent, trivial, complex).
• The changelog is updated with changes that affects the users of the charm.
• The application version number is updated in github-runner-manager/pyproject.toml.

Since the charm itself wasn't updated, I didn't update the application version number.