(nordigen): ability to set secrets via the UI (#968)

packages/desktop-client/src/components/Modals.js

packages/desktop-client/src/components/alerts.tsx

packages/desktop-client/src/components/common.js

packages/desktop-client/src/components/common/Button.tsx

packages/desktop-client/src/components/common/Modal.tsx

...ges/desktop-client/src/components/modals/CreateAccount.js

...sktop-client/src/components/modals/NordigenExternalMsg.js

...sktop-client/src/components/modals/NordigenInitialise.tsx

packages/desktop-client/src/hooks/useNordigenStatus.ts

packages/loot-core/src/server/main.ts

packages/loot-core/src/types/main.handlers.d.ts

upcoming-release-notes/968.md