Move all posts into collections and update Liquid templates

_config.yml

@@ -62,10 +62,6 @@ atom_feed:
 
 og_image: "assets/images/og_image.jpg"
 
-stay_on_top_categories:
-  - 初めての方へ
-  - a
-
 footer:
   links:
     - label: "Twitter"
@@ -82,7 +78,6 @@ defaults:
   # _posts
   - scope:
       path: ""
-      type: posts
     values:
       layout: single
       author_profile: false
@@ -90,18 +85,49 @@ defaults:
       show_date: false
       toc: true
       toc_sticky: true
-  # _pages
-  - scope:
-      path: "_pages"
-      type: pages
-    values:
-      layout: single
-      author_profile: false
-      show_date: false
 
-category_archive:
-  type: liquid
-  path: /categories/
 tag_archive:
   type: liquid
   path: /tags/
+
+collections_dir: collections
+
+collections_order:
+  - beginners
+  - build
+  - u-boot
+  - linux
+  - tips
+  - meta
+
+collections:
+  beginners:
+    output: true
+    name: For Beginners
+    order:
+      - get-started.md
+      - roadmap.md
+  build:
+    output: true
+    name: 手動ビルド
+    order:
+      - uboot.md
+      - linux.md
+      - copy-sd-card.md
+  u-boot:
+    output: true
+    name: U-Boot
+    order:
+     - boot-eboot.md
+     - boot-usb.md
+  linux:
+    output: true
+    name: Linux
+    order:
+      - package-list.md
+  tips:
+    output: true
+    name: Tips
+  meta:
+    output: true
+    name: Meta