Adds a button similar to the user manual at the bottom of each page.
This is done to give people a place to report issues other than the documentation repository which should be limited to the user manual.
With this change also comes a new issue template with helpful text and a redirect for people looking to submit an issue with Blender.
I would also like to add a Documentation label too but that requires configuring with the Gitea project.
Pull Request: https://projects.blender.org/blender/blender/pulls/115865
