chore(develop): release 1.21.0

:robot: I have created a release beep boop

add user costs and capital costs dialog (3053d28)
update intervention sidebar and page nav to be dynamic ready to support additional fortification modes (9f0d9ae)

minor tweaks (4d581c5)
move help dialogs to nre performance page (0195fdd)
nginx tweak allow cors for assets/version.json (#1492) (e7191f4)
quality if life and text imporvements to LSFF CE module (f72e81d)
resolve issue with monthly food chart failing when good groups not present in every month (d67e333)
restructure CE paes 1 & 2 to remove baseline and move fortification performance to single tab (d5f0726)
styling improvement (f834ec4)
summary costs include average annual costs. Styling tweaks (c320c2b)
susu chart styling improvements (6ab9f62)

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