DOC: Fix code of conduct link
closes #35855

LGTM - does this now work if you build the docs locally?  > LGTM - does this now work if you build the docs locally?

Yes! Built via ./pandas_web.py pandas. Here is my best attempt at test evidence (note on hover showing corrected link in bottom left)

<img width="1327" alt="Screen Shot 2020-08-22 at 4 18 57 PM" src="https://user-images.githubusercontent.com/69096687/90965117-51af7480-e493-11ea-89bd-87f8186c1eb2.png">
 I too built this locally and can confirm it works - thanks @21CSM, and welcome!