MAINT: doc: Remove doc/summarize.py
MAINT: doc: Remove doc/summarize.py

The code in doc/summarize.py is no longer used and it is
not being maintained, so remove it.

Closes gh-15708.

abalkin/numpy,rgommers/numpy,rgommers/numpy,grlee77/numpy,simongibbons/numpy,madphysicist/numpy,pdebuyl/numpy,seberg/numpy,WarrenWeckesser/numpy,charris/numpy,madphysicist/numpy,mhvk/numpy,grlee77/numpy,anntzer/numpy,simongibbons/numpy,mhvk/numpy,jakirkham/numpy,pbrod/numpy,pdebuyl/numpy,simongibbons/numpy,seberg/numpy,mattip/numpy,endolith/numpy,mattip/numpy,jakirkham/numpy,rgommers/numpy,pbrod/numpy,anntzer/numpy,madphysicist/numpy,pdebuyl/numpy,pbrod/numpy,mhvk/numpy,madphysicist/numpy,madphysicist/numpy,endolith/numpy,pbrod/numpy,rgommers/numpy,seberg/numpy,WarrenWeckesser/numpy,seberg/numpy,grlee77/numpy,WarrenWeckesser/numpy,pbrod/numpy,grlee77/numpy,mhvk/numpy,charris/numpy,anntzer/numpy,abalkin/numpy,abalkin/numpy,simongibbons/numpy,jakirkham/numpy,endolith/numpy,numpy/numpy,WarrenWeckesser/numpy,charris/numpy,endolith/numpy,pdebuyl/numpy,simongibbons/numpy,mhvk/numpy,mattip/numpy,numpy/numpy,mattip/numpy,charris/numpy,grlee77/numpy,WarrenWeckesser/numpy,jakirkham/numpy,numpy/numpy,anntzer/numpy,jakirkham/numpy,numpy/numpy