Recognize Colab links #460
                
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Closes #459
Admittedly, this has made a bit of a mess of the regex approach here, but it still passes tests.
What I'm not familiar enough with, is whether all links like
/folders/are also like/drive/folders/, any insight there? If so, maybe we can simplify a bit.PS is it better to not use a real link to a colab notebook here? 🤔