feat: improve UX for add post form

package-lock.json

package.json

src/components/annoucements/AnnouncementEditModal.jsx

src/components/cards/Card.jsx

src/components/cards/CardBody.jsx

src/components/mde/MarkdownEditor.jsx

src/components/modals/ModalWithActions.jsx

src/components/posts/PostEditModal.jsx

src/components/posts/RejectPostModalConfirm.jsx

src/components/program/ProgramEntryEditModal.jsx

src/containers/AddPostForm.jsx

src/pages/Home.jsx