Change of marketing website

## Existing pages
* [1] Old marketing website (green): https://eclipse-score.github.io/ via [eclipse-score.github.io](https://github.com/eclipse-score/eclipse-score.github.io)
* [2] New marketing website (purple): https://eclipse.dev/score via [eclipse-score-website](https://github.com/eclipse-score/eclipse-score-website), [eclipse-score-website-preview](https://github.com/eclipse-score/eclipse-score-website-preview) and [eclipse-score-website-published](https://github.com/eclipse-score/eclipse-score-website-published) (documentation missing why it has 3 repos)
* [3] platform documentation website (green): https://eclipse-score.github.io/score/main via [score](https://github.com/eclipse-score/score)
* [4...50] documentation of modules etc (green)

## Goal / Tasks
1. https://eclipse-score.github.io/ is empty, redirects to [2]
2. Adjust design of "green" websites [3...50] to "new purple colors" [2]
*probably by adjusting files in https://github.com/eclipse-score/docs-as-code/tree/main/src/assets/css*

## out of scope of this ticket

### Extension 1
- Change "Docs" link in [2] from internal page to [3]

### Extension 2
- In platform documentation [3] add the marketing website [2] header, make sure it "looks good" *probably by adding a custom template to score repository somehow*

### Extension 3
* Delete redundant content from [2] or [3]

### Extension 4
* https://eclipse-score.github.io/ shows content from [score](https://github.com/eclipse-score/score)
* https://eclipse-score.github.io/score does not exist
* Risk: folders in [score](https://github.com/eclipse-score/score) can collide with repository names. As both are presented under https://eclipse-score.github.io/XXX

### Extension 5
* Discuss changing "main" to "latest", as "main" is non intuitive