Updated readme to reflect AlbumentationsX

[ternaus]

Summary by Sourcery

Update README to mark Albumentations as unmaintained and guide users toward the new AlbumentationsX successor with licensing details, migration instructions, and refreshed links.

Documentation:

• Add prominent notice that Albumentations is no longer maintained and redirect development to AlbumentationsX
• Describe two user paths: continue with original (no updates) or upgrade to AlbumentationsX with dual-license details
• Provide simple migration commands and ensure existing code remains compatible
• Update documentation and demo links to point to current resources
• Reorganize sponsorship and partner sections for clarity

[sourcery-ai]

Reviewer's Guide

This PR overhauls the README to announce the end of maintenance for Albumentations and direct users to the new AlbumentationsX successor—including migration instructions, licensing details and updated support links—while pruning outdated content and reorganizing sponsorship sections, plus a minor update to the rules metadata file.

File-Level Changes

Change	Details	Files
Deprecation notice and successor migration guide	Introduce “Important Notice” deprecation banner Add AlbumentationsX overview with dual-license warning Provide upgrade options and migration commands Include “Learn More” section with repo, pricing, and community links	README.md
Reorganize sponsorship and partner promotions	Remove original partner tables and sponsor callouts Reinsert GitAds sponsorship block at bottom Adjust sponsorship call-to-action placement	README.md
Prune outdated sections and update links	Remove “use with deep learning frameworks” section and TOC entry Update installation and documentation URLs Replace online demo link	README.md
Minor rules metadata update	Apply housekeeping changes to rules file	.cursor/rules/albumentations-rules.mdc

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[sourcery-ai]

Hey @ternaus - I've reviewed your changes and they look great!

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[Copilot]

Pull Request Overview

This PR updates the main README to declare Albumentations end-of-life, introduce the new AlbumentationsX successor, and refresh installation/docs links; it also adds a minor testing guideline in the project rules.

• Mark repository as unmaintained and point users to AlbumentationsX
• Provide migration steps, dual‐license warning, and updated links
• Append a rule in .cursor/rules about placing new tests in the tests folder

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
README.md	Adds “no longer maintained” notice, introduces AlbumentationsX and migration guide; updates links and reorders content
.cursor/rules/albumentations-rules.mdc	Adds a rule advising new tests be created in the tests folder

Comments suppressed due to low confidence (2)

README.md:46

• The nested list under 'Dual licensed:' currently uses '- -', which can break markdown rendering. Use two spaces before the dash (i.e. ' - AGPL-3.0: ...') to maintain proper list nesting.

  - **AGPL-3.0**: Free ONLY for projects licensed under AGPL-3.0 (not compatible with MIT, Apache, BSD, etc.)

README.md:36

• [nitpick] This 'Best for:' line appears unindented under option 1. Indent it to align with the numbered list item so it’s rendered as a sub‐point of '1. Continue Using Albumentations'.

**Best for:** Projects that work fine with the current version and don't need updates