remove .github/ISSUE_TEMPLATE.md

[wojsmol]

Summary of Changes

This file is no longer supported and we are using newer issue templates anyway

Refs:
https://github.blog/changelog/2025-02-18-github-issues-projects-february-18th-update/#%f0%9f%8c%85-single-issue-templates-issue_template-md-will-be-retired

Testing Instructions

code review

Actual result BEFORE applying this Pull Request

/.github/ISSUE_TEMPLATE.md exists

Expected result AFTER applying this Pull Request

/.github/ISSUE_TEMPLATE.md don't exists

Link to documentations

Please select:

• Documentation link for docs.joomla.org:

• No documentation changes for docs.joomla.org needed

• Pull Request link for manual.joomla.org:

• No documentation changes for manual.joomla.org needed

[ceford]

I see the list of issue types when creating a new issue on GitHub but the Joomla Issue Tracker does not offer a choice. Which template does it use? Also, I see the ISSUE_TEMPLATE.md file to be deleted from the code. I am probably not qualified to test this PR, so just curious to see the outcome.

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[wojsmol]

but the Joomla Issue Tracker does not offer a choice. Which template does it use?

@ceford I checked that now and jissues (Joomla Issue Tracker) is using .md file stored in it codebase https://github.com/joomla/jissues/blob/c8132f29ab03ae12b234f0822fdd1440a2a544e1/src/App/Tracker/tpl/new-issue-template.md so it's not affected by this PR.

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[brianteeman]

I have tested this item ✅ successfully on 95e6feb

file not used

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[obuisard]

I have tested this item ✅ successfully on 95e6feb

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[richard67]

RTC

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[rdeutz]

Thanks