Fix dead links (#1915)
Fix dead links (#1915)

Looks like at some point Documentation was moved around and these links broke. Please confirm they now point to the correct destination. I was debating whether they should point to the GitHub documentation or the prettier documentation on the website. Let me know which one is preferred in case I need to change it. I set them to point to GitHub as they were before.
opsdroid/opsdroid,jacobtomlinson/opsdroid,FabioRosado/opsdroid