Remove text that does not apply to this repo

[brownsarahm]

the issue template maybe should get more updates, but this seems like an easy win.

Remaining issues: (can be sent into issues or added here)

• it says is a template for bug or feature, but it only has helper text for bugs.
• (unsure) the reprex being defaulted to R code may not be necessary?

[zkamvar]

Thank you! I definitely think it could use some more improvements. I agree that we should include a template for feature requests, but the reprex should continue to default to R code since this engine primarily works in R (though we do use some Lua to transform Markdown to HTML).

One thing that I would like to do in the future is to make sure that people know to open issues in the Workbench repo if they have any general questions or bug reports that the cannot track down to a specific package.