Update issue templates to latest one

[orangekame3]

Summary

GitHub has rolled out new issue forms for public repository. https://github.blog/changelog/2021-06-23-issues-forms-beta-for-public-repositories/

I remove the markdown type ISSUE_TEMPLATE and add yml type ISSUE_TEMPLATE (newly).

Related Issue

https://github.com/Qiskit/qiskit-tutorials/issues/1252

Details

See new template form here :arrow_down:

bug

https://github.com/orangekame3/qiskit-tutorials/blob/Issue%231252/.github/ISSUE_TEMPLATE/bug-report.yml

documentation

https://github.com/orangekame3/qiskit-tutorials/blob/Issue%231252/.github/ISSUE_TEMPLATE/documentation.yml

feature

https://github.com/orangekame3/qiskit-tutorials/blob/Issue%231252/.github/ISSUE_TEMPLATE/feature-request.yml

[CLAassistant]

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