Merge remote-tracking branch 'dc/new-homepage' into new-homepage

# Conflicts:
#	static/css/core.scss
#	static/js/apps/base/components/header_bar/header_bar.tsx
#	static/js/apps/base/components/header_bar/menu_desktop.tsx
#	static/js/apps/base/components/header_bar/menu_desktop_rich_menu.tsx
#	static/js/apps/base/components/header_bar/menu_mobile.tsx
#	static/js/apps/base/components/header_bar/menu_mobile_rich_menu.tsx
#	static/js/apps/base/header_app.tsx
#	static/js/apps/base/main.ts
#	static/js/apps/homepage/app_v2.tsx
#	static/js/shared/types/base.ts