Show suggested follows on search screen in mobile layout (#9010)

Reminder: Suggestions were added in #7918 and are based on who you
interact with who you do not follow. E.g. if you boost someone a lot
from seeing other people's boosts of that person, it makes sense you
might be interested in following the original source; or if you reply
to someone a lot, maybe you'd want to follow them

Each suggestion can be dismissed

app/javascript/mastodon/actions/suggestions.js

@@ -0,0 +1,52 @@
+import api from '../api';
+import { importFetchedAccounts } from './importer';
+
+export const SUGGESTIONS_FETCH_REQUEST = 'SUGGESTIONS_FETCH_REQUEST';
+export const SUGGESTIONS_FETCH_SUCCESS = 'SUGGESTIONS_FETCH_SUCCESS';
+export const SUGGESTIONS_FETCH_FAIL    = 'SUGGESTIONS_FETCH_FAIL';
+
+export const SUGGESTIONS_DISMISS = 'SUGGESTIONS_DISMISS';
+
+export function fetchSuggestions() {
+  return (dispatch, getState) => {
+    dispatch(fetchSuggestionsRequest());
+
+    api(getState).get('/api/v1/suggestions').then(response => {
+      dispatch(importFetchedAccounts(response.data));
+      dispatch(fetchSuggestionsSuccess(response.data));
+    }).catch(error => dispatch(fetchSuggestionsFail(error)));
+  };
+};
+
+export function fetchSuggestionsRequest() {
+  return {
+    type: SUGGESTIONS_FETCH_REQUEST,
+    skipLoading: true,
+  };
+};
+
+export function fetchSuggestionsSuccess(accounts) {
+  return {
+    type: SUGGESTIONS_FETCH_SUCCESS,
+    accounts,
+    skipLoading: true,
+  };
+};
+
+export function fetchSuggestionsFail(error) {
+  return {
+    type: SUGGESTIONS_FETCH_FAIL,
+    error,
+    skipLoading: true,
+    skipAlert: true,
+  };
+};
+
+export const dismissSuggestion = accountId => (dispatch, getState) => {
+  dispatch({
+    type: SUGGESTIONS_DISMISS,
+    id: accountId,
+  });
+
+  api(getState).delete(`/api/v1/suggestions/${accountId}`);
+};