Improve shift issue templates

[damienfraud]

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• I've read, understood, and done my best to follow the CONTRIBUTING guidelines
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Issue Link 🔗

Closes #2 - Improve shift issue templates

Goals ⚽

We should have up-to-date issue templates that are relevant with what we are doing in shift.

[romsi]

@damienfraud it should be nice to have an example. Maybe using the format preferred/not preferred.