Remove "Overriding vs. Extending" Docs.
Remove "Overriding vs. Extending" Docs.

I know we discussed this a little bit somewhere and rewriting this
section was suggested. However, I don't see any reason to keep it
around. This was always a django issue but we provided a
mezzanine-specific solution. Now that there's a django solution, why
clutter our docs with it?

stephenmcd/mezzanine,molokov/mezzanine,frankier/mezzanine,ryneeverett/mezzanine,christianwgd/mezzanine,molokov/mezzanine,readevalprint/mezzanine,frankier/mezzanine,christianwgd/mezzanine,dsanders11/mezzanine,christianwgd/mezzanine,dsanders11/mezzanine,jerivas/mezzanine,ryneeverett/mezzanine,stephenmcd/mezzanine,wbtuomela/mezzanine,readevalprint/mezzanine,jerivas/mezzanine,readevalprint/mezzanine,stephenmcd/mezzanine,jerivas/mezzanine,wbtuomela/mezzanine,ryneeverett/mezzanine,wbtuomela/mezzanine,dsanders11/mezzanine,frankier/mezzanine,molokov/mezzanine