feat: Show image and other news on news pages

[MoritzWeber0]

On news pages, show the image and other news pages. On mobile devices, only the image is displayed.
While changing some parts, I refactored some code to use pure SCSS instead of bootstrap.

Resolves #144

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[Copilot]

Pull Request Overview

This PR implements a new feature for news pages by showing an image and additional news items, and it includes a refactor from Bootstrap-based layout to custom SCSS. Key changes include new templates for news pages, layout adjustments for operator and country pages, and style updates using native media queries.

Reviewed Changes

Copilot reviewed 17 out of 17 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
layouts/partials/internal_link.html	Added simple, self-contained internal link helper
layouts/operator/single.html	Updated layout structure replacing Bootstrap grid
layouts/news/single.html	New news page template displaying image and news list
layouts/news/list.html	Introduced list view for news teasers
layouts/country/single.html	Modified layout for country pages with simplified markup
layouts/_default/single.html	Adjusted default template structure
i18n/en.yaml & i18n/de.yaml	Updated translations for news-related keys
assets/sass/*	Refactored SCSS to use native @media queries and grid layout
CONTRIBUTING.md	Updated dependency reference from Bootstrap to pagefind

[therobrob]

Thanks for refactoring the sidebar, i like the new presentation of the single news!! :) – as mentioned in the files already, we should ask ourselves whether we should also use the bem-logic for consistency in new code. :) i´ve made some comments, it would be cool to take a look :)

[MoritzWeber0]

Thanks for refactoring the sidebar, i like the new presentation of the single news!! :) – as mentioned in the files already, we should ask ourselves whether we should also use the bem-logic for consistency in new code. :) i´ve made some comments, it would be cool to take a look :)

Thanks for the good review and being picky about applying BEM. I support the efforts to keep the code consistent and updated the newly introduced classes to BEM logic. Not 100% sure about .o-news_list. Can you take another look?

[lenderom]

@therobrob can we merge this?

[therobrob]

@lenderom not yet.