Restrict helm-docs to charts with changes

[djjudas21]

Is your feature request related to a problem ?

When helm-docs runs, it always updates docs for all charts, but just charts which have changes.

For example 9a18a37 makes changes to the Wizarr chart, but helm-docs updates docs for Jellyfin and lldap too, which then causes a pipeline failure because changes have been made to charts which have not received a version bump.

Describe the solution you'd like.

Helm-docs should only update documentation for charts that have changes

Describe alternatives you've considered.

None

Additional context.

No response