Convert Github Issue Templates to YAML

[junwoo091400]

About

This PR converts existing Markdown based Github Issue templates to YAML.

Changes in visual appearance is shown below.

Benefits

For an intuitive sense of the benefit of having a YAML issue template, visit betaflight's issue page; https://github.com/betaflight/betaflight/issues/new/choose

The YAML provides following benefits:

1. We can set required fields (e.g. Flight log), and have the user not have to think about editing the raw markdown, as it is rendered like a web UI
2. We can have each fields having a description only rendered when creating the Issue, so that the final Issue won't have such auxilary comments inside.
3. We can provide direct links to the resources for support/documentation issue cases. Users don't have to click the button then find the Markdown link for the support link now.

For more information on the YAML templates, read: https://docs.github.com/en/communities/using-templates-to-encourage-useful-issues-and-pull-requests/configuring-issue-templates-for-your-repository

Comparison

Previous markdown based template 👎

New YAML based template (example from betaflight) 👍

[MaEtUgR]

Sure, why not. Thanks for looking into the workflow 👍