Add deprecated text to README

[acronhub]

What

• Added a note to the README indicating that this repository is deprecated.
• The reason for deprecation is that we recommend using qiita-marker instead.

[gemini-code-assist]

Summary of Changes

Hello @acronhub, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a significant update to the README.md file by adding a clear deprecation notice. The primary purpose is to inform users that this repository is no longer recommended for use and to guide them towards an actively maintained alternative, qiita-marker. This change ensures that users are aware of the project's status and are directed to the correct resource.

Highlights

• Repository Deprecation Notice: A prominent deprecation warning has been added to the README.md file, clearly indicating that the repository is no longer actively maintained.
• Alternative Project Recommendation: The deprecation notice includes a direct recommendation and link to qiita-marker as the preferred alternative for users.

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[Copilot]

Pull Request Overview

This PR adds a deprecation notice to the README, informing users that the repository is no longer maintained and directing them to use qiita-marker as an alternative.

• Adds a deprecation warning at the top of the README
• Includes a link to the recommended replacement repository (qiita-marker)

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_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}

[gemini-code-assist]

Code Review

This pull request adds a deprecation notice to the README.md file. The change is a good initiative. I've provided one suggestion to rephrase the notice for better clarity and conciseness, which will help prevent potential confusion for users reading the documentation.

[gemini-code-assist]

This deprecation notice is a great addition. For improved clarity and to avoid potential confusion with the recommendation to use qiita-markdown later in the file (line 15), you could make this notice more direct by combining the two sentences.

Suggested change

	Note that this repository is now deprecated.
	Please use the [qiita-marker](https://github.com/increments/qiita_marker).
	This repository is deprecated. We recommend using [qiita-marker](https://github.com/increments/qiita_marker) instead.

[acronhub]

CI is not completing due to Ubuntu 18.04 being deprecated and no longer supported. Since this repository is being archived, I decided not to wait for the CI completion.

Reference: https://github.blog/changelog/2022-08-09-github-actions-the-ubuntu-18-04-actions-runner-image-is-being-deprecated-and-will-be-removed-by-12-1-22/

[P-SiZK]

LGTM!