feat: Use different icons for booking expander meta

[MoritzWeber0]

• Improve screen reader support, they can now read "FIP 50 Tickets bookable" or "FIP Global Fare not bookable", before it tried to read the icon as "no entry sign" or "check mark".
• Use color on the text for second identification of the value (color in addition to the icon).
• Get rid of the unicode icons and use Material Icons instead for better consistency.
• Text is now left-aligned.

[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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