Add key-considerations pages as top level section
[IATI/IATI-Extra-Documentation#156] Generate relevant ruleset pages

Pull in the extra documentation text onto the Standard Ruleset page, and
copy the ruleset spec automatically, instead of using a manual copy.
Update Submodules
Updates gen.py to version-1.05
Revert "Remove extra docs from element pages"

This reverts commit 07e222bdd4bfb17a957ac27ddb17f83202ffb213.
Merge branch 'version-1.05' into version-2.01

Conflicts:
	IATI-Codelists
	IATI-Extra-Documentation
	IATI-Schemas
	gen.py