Issue template form (#16349)

Issue template form (#16349)

* Create issue template using new format

This issue template has been based off of the current issue creation workflow defined in the ISSUE_TEMPLATE.md file
This commit allows for that issue template (which is a legacy method of creating an issue) to be deleted

* Delete old issue template file

This commit deletes the old issue template file, as it is both legacy and replaced by ISSUE_TEMPLATE/issue.yaml

* Adjust file upload and remove code of conduct checkbox

* Block blank issue creation

* Update feedback

Removed most requirements
Updated prompt to include instruction to state whether using try.gitea.io
Added default value to Gitea version

* Create Feature Request issue form

* Update and rename issue.yaml to bug-report.yaml

* Enable blank issue creation

Co-authored-by: a1012112796 <1012112796@qq.com>
* Update config.yaml

* Remove default & placeholder from Gitea version

* Create issue template in .gitea directory

* Add relevant bug report message to feature request

* Adjust name to remove banner

There is a banner that tells you to create a config.yml when you already have a config.yaml
Renaming the file stops this from occurring.

* Add UI bug report form

* Remove unnecessary question

Co-authored-by: a1012112796 <1012112796@qq.com>
Co-authored-by: techknowlogick <techknowlogick@gitea.io>
Co-authored-by: 6543 <6543@obermui.de>
Co-authored-by: Lauris BH <lauris@nix.lv>