docs: Added new Advanced Guides section to Pilot's Corner

[frankkopp]

closes #316

Summary

New section for Advanced A320 features not covered in the Beginner Guide.
Meant as a loose collection of features along the current development.
More structure can and will be introduced when necessary.

Moved AFloor and Fix Info features guides there.

Location

Pilot's Corner

Discord username (if different from GitHub): Cdr_Maverick#6475

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[Valastiri]

need 2 CC the bot team to update links -- unless temporary redirects first

issue created in https://github.com/flybywiresim/discord-bot/

[Benjozork]

Make sure we still mention A. FLOOR outside of this / link to the adv guide in common issues

[Valastiri]

• Fix Info requires a typo change in #overview -> raduises to "radii"