Update page_creation.rst to focus just on pages, splitting other info to separate doc#4690

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ownsourcing wants to merge 3 commits intosymfony:2.6from

ownsourcing:patch-4

Commits on Dec 27, 2014

Update page_creation.rst
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Split non-page-creation topics from page_creation.rst off to separate app_structure doc

VitaXL
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Commits on Dec 28, 2014

de-emphasise bundle creation on page_creation.rst and flesh it out further on app_structure.rst
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