docs: Feat holds

[Sven-Janssens]

Fixes #450

Summary

New guide to holds

Location

Edit: (Made by @Valastiri to add preview link)
Direct Preview Link

discord: Sven Janssens#6905

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[Valastiri]

Can you remove line 41 from mkdocs.yml?
This one below:

        - pilots-corner/advanced-guides/flight-planning/holds.md

It'll be needed for the merge anyways and allows quick lookup when checkout ur preview thru vercel. Thanks!

[frankkopp]

I'm not a big fan of the tabs component. In my view it makes the page less readable and harder to divide into subsection which could be part of the in-page navigation.

I would especially avoid it for the programming hold part. A bullet point list would be much better in this case.

[Valastiri]

Small changes

Full feature review would be later just some things I noticed. Other things discussed in DMs for formatting can be done later.

[Valastiri]

Image optimization noted. See Discord DMs to facilitate.

Heading suggestions as per issues at top of page (can move this around later):

# Overview
## Why Hold?
## Identifying Holds
## Hold Standards
## Programming Holds <- this separates the holding stuff from the standards before it
### MCDU Setup (maybe change this later but could come with new formatting)
### Descending in the Hold
### Leaving the Hold

Edited above.
Please ensure capitalization as indicated above.

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