feature: added faq

[therobrob]

Description

In this PR i've added the following:

• type "FAQPage" and mainEntity "Question" in structured data
• content in "General Information"
• filename structure (prefix _), because without the prefix the Page Type isn't recognized correctly.

Unfortunately there is no appropriate way to add the questions and answers to structuredData.html without duplicating them. So i've decided to add them to the front matter of the .md-file.

I would appreciate it if you would review the questions and add more as needed. :)

Checklist

• Check the License of new pictures (non-commercial use without attribution)

The content was modified in the following languages:

• English
• German

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[lenderom]

Open topics:

• I will add additional informations (FIP Introduction and then the FAQ Section)
• We should find a way so it's not necessary to write the FAQ part multiple times to make it usable in the structured data. Maybe @MoritzWeber0 has an idea for that?

[therobrob]

For Context: with .Page.Content we get the markup, but without Reflex it is not possible to extract the information needed. I tried using Regex but it didn’t work properly.

[therobrob]

We should decide if we want to use anchor links and/or expander for the questions

[lenderom]

For me as reminder:

Offene inhaltliche Punkte

Grenztarifpunkte und Bahnhöfe erklären
Allgemein bis wohni gelten Tickets bei internationalen Fahrten
Tickets im eigenen Land
Abschnitt nur für DB Mitarbeiter (Was gibt es noch für Möglichkeiten)
Wie finde ich das günstigste Ticket
Wie komme ich das Tickets/Freifahrtschein/FIP Ausweis
Was ist der FIP Ausweis (für Angehörige)
3 Tickettypen (Freifahrt, FIP 50, Globalpreis)
Wie finde ich raus, wer meinen Zug betreibt? (Teilweise Zuständigkeitswechsel an der Grenze bzw. gelten die Tickets dann nur bis zum Grenzpunkt)
Infos aus Übersicht von MeineDB einpflegen
Potentielle Visualisierungen erstellen
Beispiele für ein Gutes Vorgehen (wie recherchiere ich)