Update issue templates

[Olympic1]

Moved our ISSUE_TEMPLATE over to the new GitHub system so users get an option to post a Bug or Feature report.

Also moved over our code of conduct and contributing guidelines to the new system.

[HebaruSan]

This might be even more beneficial in the NetKAN repo, since those reports can range from bugs to enhancements to mod requests.

[Olympic1]

I just found this on GitHub Help:
https://help.github.com/en/articles/creating-a-default-community-health-file-for-your-organization

You can create default community health files, such as CONTRIBUTING and CODE_OF_CONDUCT, for your organization. Default files will be used for any public repository in your organization that does not contain its own file of that type.

If we create a .github repository in our GitHub organization, we could add the ISSUE_TEMPLATE (and others) to it. That template can then be used over all our public repo's. That means I have to move the files from this PR tto that new repo, so we don't overwrite the files here.

Do we have a page where people can sponsor us? I only found the patreon page for CKAN from @pjf. Or should we still use that page?