:sparkles: address #74 | added get single page action

vue-theme/src/store/modules/page.js

 const state = {
     all: [],
     loaded: false,
+    singlePage: null
 }
 
 // getters
             commit('PAGES_LOADED', true)
         })
     },
+    getSinglePage({ commit }, id) {
+        commit('CLEAR_SINGLE_PAGE')
+        commit('PAGES_LOADED', false)
+        api.getSingleType('pages', id, page => {
+            commit('STORE_FETCHED_SINGLE_PAGE', page)
+            commit('PAGES_LOADED', true)
+        })
+    },
 }
 
 // mutations
     STORE_FETCHED_PAGES(state, { pages }) {
         state.all = pages
     },
+    STORE_FETCHED_SINGLE_PAGE(state, page) {
+        state.singlePage = page
+    },
     CLEAR_PAGES(state) {
         state.all = []
     },
+    CLEAR_SINGLE_PAGE(state) {
+        state.singlePage = null
+    },
     PAGES_LOADED(state, val) {
         state.loaded = val
     },