[FW][IMP] upgrade: overhaul upgrade doc #6316
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Overhauling of the documentation for Upgrade as part of the need for Partner documentation for upgrade (task 3171474 )
This keep most of the information intact, merging the FAQ into the documentation itself, improves the structure (one page), remove redundancies, ...
It is part of a 2-phases project where the second phase would be to add information about upgrade for developers (currently sitting in developer/reference/upgrade.rst but that will be moved to developer/howtos.html) to contain informations about migration scripts, upgrading custom code, etc ...
Related PR : #5774 #5953
Forward-Port-Of: #6274