CI, Releases: Add Packages to Release page

What

Depends on !16564 (merged)

Add packages assets to Release page.

It also changes its headers colors.

Why

How

Add dependency to the rpm packages artefacts in the the job_release_page_test.

Add section and links in the release page publish script.

Manually testing the MR

Check https://gitlab.com/nomadic-labs/tezos/-/pipelines/1653528890 and https://release-page-test.nomadic-labs.com/

Checklist

• Document the interface of any function added or modified (see the coding guidelines)
• Document any change to the user interface, including configuration parameters (see node configuration)
• Provide automatic testing (see the testing guide).
• For new features and bug fixes, add an item in the appropriate changelog (docs/protocols/alpha.rst for the protocol and the environment, CHANGES.rst at the root of the repository for everything else).
• Select suitable reviewers using the Reviewers field below.
• Select as Assignee the next person who should take action on that MR