[Docs] Fix formatting and add iCloud Shared Library migration guide

[Shanthy17]

Description

This PR includes documentation improvements across multiple files:

1. Added comprehensive iCloud Shared Library migration guide (docs/photos/migration/from-apple-photos/index.md):

   • New section explaining how to migrate from iCloud Shared Photo Library to Ente
   • Step-by-step instructions for moving photos from Shared Library to Personal Library on iOS/iPadOS and macOS
   • Important notes about iCloud sync status before leaving Shared Library
   • Guidance on importing into Ente after migration
   • Detailed explanation of metadata preservation (EXIF, favorites, album membership, edited photos, Live Photos)

2. Fixed markdown formatting inconsistencies:

   • Corrected indentation in code blocks and list items across multiple files (manual.md, gallery-mode.md, first-document.md, collections.md)
   • Fixed YAML frontmatter indentation in numerous FAQ and feature documentation files
   • Aligned markdown table formatting for better readability (env-var.md, gallery-mode.md)
   • Fixed description field formatting in lima.md

These changes improve documentation clarity and consistency while providing users with clear guidance on migrating their iCloud Shared Photo Library to Ente.

Tests

N/A - Documentation-only changes. Markdown formatting can be validated by the documentation build process.

https://claude.ai/code/session_01W3GmRcKib2W2pA6VpspB9x

[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: 506ed80869

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

Codex can also answer questions or update the PR. Try commenting "@codex address that feedback".

[chatgpt-codex-connector]

Point shared-library guide to an existing sharing page

The new link target (/photos/features/sharing/) does not exist, which causes the docs build to fail dead-link validation and leaves readers with a 404. I verified this in docs/ with npm run build, which reports Found dead link /photos/features/sharing/index in file photos/migration/from-apple-photos/index.md; this should link to one of the existing sharing docs routes (for example the share or sharing-and-collaboration/share page).

Useful? React with 👍 / 👎.

[setalp]

@Shanthy17 - Seems like there are 2 versions of the note. Not sure which one to keep