add archive notice to readme

[loadtheaccumulator]

Description

Add archive notice to README file.

FIXES: HMS-5770

Type of change

What is it?

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Documentation update
• Tests update
• Refactor

Summary by Sourcery

Documentation:

• Revise archive notice wording to present tense and remove outdated alternative suggestion for Red Hat Edge Manager

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This PR updates the README archive notice from future to present tense and removes outdated alternative guidance.

File-Level Changes

Change	Details	Files
Revised archive notice wording and removed alternative guidance	Changed future tense (‘will no longer be supported’) to present tense (‘is no longer supported’) Updated ‘will be discontinued’ to ‘is discontinued’ Removed link and referral to Red Hat Edge Manager Simplified the overall sentence structure	README.md

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[sourcery-ai]

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

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