docs: add <meta> tags

For the pages listed as "Group 3" in flybywiresim#791

Author: marcpicaud

docs/pilots-corner/beginner-guide/after-landing.md

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+---
+title: A32NX Beginner Guide - After Landing and Taxi to Gateq
+description: Learn the correct procedures for after landing and vacating the runway with the FlyByWire A32NX.
+---
+
 # After Landing and Taxi to Gate
 
 This guide will explain the correct procedures after we have landed and vacated the runway and then taxiing to the designated gate.

docs/pilots-corner/beginner-guide/descent.md

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+---
+title: A32NX Beginner Guide - Descent Planning and Descent
+description: Learn how to plan and fly a descent from cruise altitude through STAR and Instrument Approach up to the final approach with the FlyByWire A32NX.
+---
+
 # Descent Planning and Descent
 
 This guide will explain the correct procedures to plan and fly a descent

docs/pilots-corner/beginner-guide/engine-start-taxi.md

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+---
+title: A32NX Beginner Guide - Engine Start and Taxi
+description: Learn how to accomplish a pushback with engine start and perform a safe taxi to the departure runway with the FlyByWire A32NX.
+---
+
 # Engine Start and Taxi
 
 This guide will explain the correct procedures to accomplish a pushback with engine start and perform a safe taxi to the departure runway.

docs/pilots-corner/beginner-guide/landing.md

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+---
+title: A32NX Beginner Guide - Approach and ILS Landing
+description: Learn how to fly a final approach and conduct an ILS landing with the FlyByWire A32NX.
+---
+
 # Approach and ILS Landing
 
 This guide will explain the correct procedures to fly a final approach and conduct an ILS landing.

docs/pilots-corner/beginner-guide/powering-down.md

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+---
+title: A32NX Beginner Guide - Powering Down
+description: Learn the correct procedures to power down the FlyByWire A32NX aircraft.
+---
+
 # Powering Down
 
 This guide will explain the correct procedures to power down the aircraft when at the gate after arriving at the destination and taxi to the designated gate.

docs/pilots-corner/beginner-guide/preflight.md

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+---
+title: A32NX Beginner Guide - Preflight
+description: Learn about the FlyByWire A32NX's features that assist in configuring and operating the aircraft.
+---
+
 # Preflight
 
 Before you start your flight in earnest, we have included various features in the A32NX that assist in configuring the aircraft and in-flight support. Some of these features require the aircraft to be powered on. Additionally, these guides will be linked in the appropriate locations throughout the beginner guide. 

docs/pilots-corner/beginner-guide/preparing-mcdu.md

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+---
+title: A32NX Beginner Guide - Preparing the MCDU
+description: Learn how to prepare the MCDU in the FlyByWire A32NX for your departure. 
+---
+
 # Preparing the MCDU
 
 This guide will help you prepare the MCDU in the A32NX for your departure. It includes a simple route that you can use to follow along easily and replicate in the simulator.

docs/pilots-corner/beginner-guide/starting-the-aircraft.md

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+---
+title: A32NX Beginner Guide - Starting the Aircraft
+description: Learn how to start the FlyByWire A32NX aircraft from a cold and dark state.
+---
+
 # Starting the Aircraft
 
 This guide will assist you with starting your aircraft. It includes images to assist you with understanding the locations of all buttons and switches.

docs/pilots-corner/beginner-guide/takeoff-climb-cruise.md

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+---
+title: A32NX Beginner Guide - Takeoff, Climb and Cruise
+description: Learn how to takeoff, climb and establish cruise altitude with the FlyByWire A32NX.
+---
+
 # Takeoff, Climb and Cruise
 
 This guide will explain the correct procedures to accomplish takeoff, climb and establish cruise altitude.