docs: create issue template config file

[HonkingGoose]

Changes:

• Use a config.yml file to prevent contributors from opening empty issues
• Redirect config questions to the discussions tab

Context:

It might be good to prevent contributors from opening empty issues (it also prevents spam, a bit).
I think it's nice to also redirect config questions a second time.

Link to relevant GitHub docs, configuring the template chooser.

Documentation (please check one with an [x])

• I have updated the documentation, or
• No documentation update is required

How I've tested my work (please tick one)

I have verified these changes via:

• Code inspection only, or
• Newly added unit tests, or
• No new tests but ran on a real repository, or
• Both unit tests + ran on a real repository

[renovate-release]

🎉 This PR is included in version 24.42.2 🎉

The release is available on:

• GitHub release
• 24.42.2

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