Adapt the top level components to dark mode (#1391)

packages/desktop-client/public/index.html

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

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

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

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

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

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

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

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

...es/desktop-client/src/components/manager/ManagementApp.js

packages/desktop-client/src/components/manager/bg.svg

packages/desktop-client/src/style/palette.ts

packages/desktop-client/src/style/themes/dark.ts

packages/desktop-client/src/style/themes/development.ts

packages/desktop-client/src/style/themes/light.ts

upcoming-release-notes/1391.md