add post calculas-formulas, update some configs

_config.yml

@@ -90,7 +90,7 @@ updated_option: 'mtime'
 
 # Pagination
 ## Set per_page to 0 to disable pagination
-per_page: 10
+per_page: 15
 pagination_dir: page
 
 # Include / Exclude file(s)
@@ -199,12 +199,12 @@ neat_js:
 
 related_posts:
   enabled: true
-  filter_threshold: 0.1
+  filter_threshold: 0.13
   related_count: 5
   weight:
     title: 0.1
-    description: 0.05
-    keywords: 0.01
-    tags: 0.005
-    categories: 0.005
-    text: 1
+    description: 0
+    keywords: 0
+    tags: 0.01
+    categories: 0.05
+    text: 0