refactor: re-organise doc structure

docs/en-gb/_nav.json

@@ -1,8 +1,13 @@
 [
   {
-    "text": "blog",
+    "text": "blogs",
-    "link": "/blog/",
+    "link": "/blogs/",
-    "activeMatch": "/blog/"
+    "activeMatch": "/blogs/"
+  },
+  {
+    "text": "projects",
+    "link": "/projects/",
+    "activeMatch": "/projects/"
   },
   {
     "text": "notifications",

docs/zh-hans/_nav.json

@@ -1,8 +1,13 @@
 [
   {
-    "text": "blog",
+    "text": "blogs",
-    "link": "/blog/",
+    "link": "/blogs/",
-    "activeMatch": "/blog/"
+    "activeMatch": "/blogs/"
+  },
+  {
+    "text": "projects",
+    "link": "/projects/",
+    "activeMatch": "/projects/"
   },
   {
     "text": "notifications",

i18n.json

@@ -111,12 +111,16 @@
     "en-gb": "Collapse",
     "zh-hans": "折叠"
   },
-  "blog": {
+  "blogs": {
-    "en-gb": "Blog",
+    "en-gb": "Blogs",
     "zh-hans": "博客"
   },
   "notifications": {
     "en-gb": "Notifications",
     "zh-hans": "通知"
+  },
+  "projects": {
+    "en-gb": "Projects",
+    "zh-hans": "项目"
   }
 }