Show header update (PLAYRTS-5405)

[pyby]

Motivation and Context

Improve the show page header so that it looks the same over all Play SRG vectors.

Description

• Align texts and badges to left.
• Reorder description elements.
• Use dark red for the broadcast information badge.
• Add new topicColors remote configuration properties to have the gradient colors.
• Add Topic gradient view with opacity option and display it in background of topic and show pages.
• TBD 🏗️

Checklist

• The branch should be rebased onto the develop branch for whole tests with nighties, but it's not required.*
• The code followed the code style as make quality passes with a green tick on the last commit.
• [ ] Remote configuration properties have been properly documented (if relevant).
• [ ] The documentation has been updated (if relevant).
• [ ] Issues are linked to the PR, if any.

* The project uses Github merge queue feature, which rebases onto the develop branch before squashing and merging the PR.