feat: pull posts and announcements from store, support posts filtering

.editorconfig

package.json

src/App.jsx

src/actions/misc.js

src/components/Chip.jsx

src/components/Dropdown.jsx

src/components/Navbar.jsx

src/components/Thumbs.jsx

src/components/annoucements/Announcement.jsx

src/components/posts/Post.jsx

src/components/posts/PostFilters.jsx

src/components/posts/PostList.jsx

src/containers/AnnoucementsContainer.jsx

src/containers/PostsContainer.jsx

src/pages/Home.jsx

src/stores.js

src/utils.js

typings/cf2021.d.ts