docs: add contributing to sidebar (#2209)
docs: add contributing to sidebar (#2209)

Added Contributing Guidelines to the introduction menu point on the sidebar. 
I think it should be as obvious as possible. 
Another good solution would be to add them to the top bar?

If this is merged, I will do the same changes for Kratos/Oathkeeper/Keto.
ory-am/go-iam,ory/hydra,ory/hydra,ory-am/go-iam,ory/hydra,ory-am/hydra,ory/hydra