feat: math category

fix: categories

_config.yml

@@ -17,6 +17,11 @@ redcarpet:
   extensions: ["strikethrough"]
 
 collections:
+  math:
+    title: math
+    output: true
+    permalink: /math/:path/
+    path: /math
   programming:
     title: programming
     output: true

_posts/2017-09-07-primitive-living-0.md

@@ -2,7 +2,10 @@
 layout: post
 title:  "Primitive Living Lessons Learned, Episode 0"
 permalink: primitive-living-lessons-0/
-categories: life, primitive-living, travel
+categories:
+  - life
+  - primitive-living
+  - travel
 excerpt_separator: <!--more-->
 author: Mahdi
 ---

_posts/2017-09-24-diy-kindle-stand.md

@@ -2,7 +2,9 @@
 layout: post
 title:  "DIY Cardboard Kindle Stand (for bed)"
 permalink: diy-cardboard-kindle-stand/
-categories: life, diy
+categories:
+  - life
+  - diy
 excerpt_separator: <!--more-->
 author: Mahdi
 ---

_posts/2017-09-27-typoclassopedia-exercise-answers.md

@@ -3,7 +3,9 @@ layout: post
 title:  "Typoclassopedia: Exercise solutions"
 date:   2017-09-27 
 permalink: typoclassopedia-exercise-solutions/
-categories: programming
+categories:
+  - programming
+  - math
 math: true
 toc: true
 author: Mahdi

math.html

@@ -0,0 +1,4 @@
+---
+layout: category
+category: math
+---