feat: Properly show updates of news articles

[MoritzWeber0]

Add a new updated attribute to articles. It should reflect the date of the last major update. This replaces the previous manual handling via updating the original date and the title. The updated date is displayed after the original date as updated tag.

In addition, add an updated partial which can be used to show the updated parts in the news article.

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[github-actions]

Hi there! 👋

Thank you for your contribution to the FIP Guide! 🚀
We appreciate your effort in making rail staff travel information more accessible. 🚄

Checklist before merging:

• Added a description to the Pull Request
• Checked the License of new pictures (non-commercial use without attribution)
• Modified content in English
• Modified content in German
• Modified content in French

[lenderom]

Thanks for the implementation. I think it's a huge improvement for the usability

[lenderom]

Thank you for the addition. I think this is a great addition for our users to see which news articles got an update. In the past this wasn't easiely accessible.

I've found some minor improvements:

When having a first glimpse on this PR, I saw badges at the article. However these are not visible anymore:

Also I find the badges a bit distracting / too prominent. For example in the sidebar:

[MoritzWeber0]

When having a first glimpse on this PR, I saw badges at the article. However these are not visible anymore:

Good catch, this was a bug with the updated logic, the page store is only initialized on first render, which didn't happen on the main page. Fixed.

Also I find the badges a bit distracting / too prominent. For example in the sidebar:

I changed it to normal text in the sidebar, which is less disturbing. For the main page it probably still make sense to generate attention. In the end we want users to recognize that there has been an update.