feat: 可設置首頁文章不顯示內容/description

feat: 主頁文章時間和文章頁文章時間可以配置顯示日期還是相對時間
feat: top_img 可配置 [留空（默認色）/顏色/漸變色/圖片鏈接/ false（不顯示top_img）]
feat: footer可配置背景 [留空/false(默認色)/顏色/漸變色/圖片鏈接/true(跟top_img一樣)]
improvement: preloader 在 pjax 下 每個頁面都會加載
improvement: 修改判斷，避免用户設置2個lightbox 而導致報錯（只能設置一個）
improvement: 精確時間顯示 （剛剛/幾分鐘前/幾小時前/幾天前/幾個月前）
improvement: 刪除不必要的語言文件和css
chore: update hexo-renderer-stylus to 2.0.1

layout/includes/head/config.pug

@@ -61,10 +61,6 @@
   let Snackbar = 'undefined';
   if (theme.snackbar && theme.snackbar.enable) {
     Snackbar = JSON.stringify({
-      bookmark: {
-        message_prev: _p("Snackbar.bookmark.message_prev"),
-        message_next: _p("Snackbar.bookmark.message_next")
-      },
       chs_to_cht: _p("Snackbar.chs_to_cht"),
       cht_to_chs: _p("Snackbar.cht_to_chs"),
       day_to_night: _p("Snackbar.day_to_night"),
@@ -94,12 +90,6 @@
     })
   }
 
-  let date_suffix = JSON.stringify({
-    one_hour: _p("date_suffix.one_hour"),
-    hours: _p("date_suffix.hours"),
-    day: _p('date_suffix.day')
-  })
-
 script.
   var GLOBAL_CONFIG = { 
     root: '!{config.root}',
@@ -114,16 +104,21 @@ script.
       error: '!{_p("copy.error")}',
       noSupport: '!{_p("copy.noSupport")}'
     },
-    bookmark: {
-      message_prev: '!{_p("Snackbar.bookmark.message_prev")}',
-      message_next: '!{_p("Snackbar.bookmark.message_next")}'
+    relativeDate: {
+      homepage: !{theme.post_meta.page.date_format === 'relative'},
+      post: !{theme.post_meta.post.date_format === 'relative'}
     },
     runtime: '!{theme.runtimeshow.enable ? _p("aside.card_webinfo.runtime.unit") : ""}',
-    date_suffix: !{date_suffix},
+    date_suffix: {
+      just: '!{_p("date_suffix.just")}',
+      min: '!{_p("date_suffix.min")}',
+      hour: '!{_p("date_suffix.hour")}',
+      day: '!{_p("date_suffix.day")}',
+      month: '!{_p("date_suffix.month")}'
+    },
     copyright: !{copyright},
     ClickShowText: !{ClickShowText},
-    medium_zoom: !{theme.medium_zoom},
-    fancybox: !{theme.fancybox},
+    lightbox: '!{ theme.medium_zoom ? "mediumZoom" : (theme.fancybox ? "fancybox" : "null" )}',
     Snackbar: !{Snackbar},
     justifiedGallery: {
       js: '!{theme.CDN.justifiedGallery_js}',
@@ -144,7 +139,7 @@ script.
         expiry: now.getTime() + expiryDay,
       }
       localStorage.setItem(key, JSON.stringify(item))
-      },
+    },
 
     get: function getWithExpiry(key) {
       const itemStr = localStorage.getItem(key)