Add loader + change post to put + style toast

src/components/Editing/Editing.tsx

src/components/Editing/editing.scss

src/components/Loader/Loader.tsx

src/components/Loader/loader.scss

src/components/MonthlyNews/MonthlyNews.tsx

src/components/Poll/Poll.tsx

src/services/monthlyNews.service.ts

src/styles/_toast.scss

src/styles/config/_typography.scss