added GitHub Issue Forms as proposed in #844

[tobirohrer]

Description

Change from GitHub templates to GitHub issue forms. See GitHub Issue Forms for more details on GitHub Issue Forms.

The main argument for using GitHub Issue Forms is that it is possible to encourage contributors to use the structure given. Additionally, the input is done by web form fields, which look nicer 😊

Fixes #844

Type of change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)

Screenshots

Before:

After:

Checklist:

• I have run the pre-commit checks with pre-commit run --all-files (see CONTRIBUTING.md instructions to set it up)
• I have run pytest -v and no errors are present.
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I solved any possible warnings that pytest -v has generated that are related to my code to the best of my knowledge.
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[WillDudley]

Great PR!