[conf.py] Fix unicode error

[etanot]

Running "make html" command to build docs, throws following error message:

Configuration error:
There is a syntax error in your configuration file: (unicode error)
'unicodeescape' codec can't decode bytes in position 1-2: truncated
\uXXXX escape (conf.py, line 302)

make: *** [Makefile:45: html] Error 2