Set default values for site variables

good for gem-based first run

_data/date_format.yml

@@ -6,6 +6,7 @@
 
 
 tooltip: "%a, %b %e, %Y, %l:%M %p %z"
+
 post:
   long: "%b %e, %Y"
   short: "%b %e"

_data/label.yml

@@ -11,10 +11,13 @@ panel:
 
 post:
   relate_posts: Further Reading
+  share: Share
   button:
     next: Newer
     previous: Older
 
 search_hint: Search   # text show on search bar
 
-pin_prompt: Pinned   # pinned prompt
+pin_prompt: Pinned    # pinned prompt
+
+read_time_unit: min   # see posts' time to read

_data/read_time.yml

@@ -1,7 +0,0 @@
-# words per minute
-wpm: 180
-
-# minimum value
-min_time: 1
-
-prompt: min

_data/share.yml

@@ -6,8 +6,6 @@
 #  © 2020 Cotes Chung
 #  MIT Licensed
 
-label: "Share"
-
 platforms:
   -
     type: Twitter