Add Packages feature to landing page

What does this MR do?

As the Packages DevOps stage is built out, we need to keep adding to the list of features on the landing page so these features are discoverable.

This is an EE MR because the landing pages for CE and EE are kept different for now.

Related issues

None.

Author's checklist

• Apply the correct labels and milestone

Review checklist

• PM's review (recommended, but not a blocker)
• Technical writer's review (required)