feat: Add BR Fares to find FIP fares

[MoritzWeber0]

BR Fares was mentioned before already, but there wasn't any information that it's possible to add the FIP card as discount to find available FIP fares. Also add the specific rover page to find available rovers with FIP.

[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

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[lenderom]

What do you think about removing the part of the rule of thumb (but keep the list of all rovers in the personal tip)?

[lenderom]

Or keeping everything until this: "allgemeine Faustregel gilt: Tickets, die ausschließlich für National Rail gelten, werden in der Regel akzeptiert. Kombinierte Bahn- und Bustickets sind meist nicht gültig." And deleting the rest?

[MoritzWeber0]

Or keeping everything until this: "allgemeine Faustregel gilt: Tickets, die ausschließlich für National Rail gelten, werden in der Regel akzeptiert. Kombinierte Bahn- und Bustickets sind meist nicht gültig." And deleting the rest?

I can remove it, but the statement itself still seems to be valid and provides a general overview over available rovers that can be checked individually on BR Fares.

I'm also a bit confused: We list the "Island Line Day Ranger" as accepted in the examples, but on BR Fares it says "No fares available.". So not sure which source is valid now.

[lenderom]

To be honest, I would just remove it. We were not 100% sure and it's nothing to rely on. BR Fares is usually pretty trustworthy.

And I guess the first two sentences of the rule of thumb are enough. Or we could keep the whole paragraph and just remove the example.