chore(gitbook): gitbook-plugin-github-buttonsを外した

close #80

Author: azu

book.json

@@ -19,12 +19,6 @@
     "github": {
       "url": "https://github.com/azu/JavaScript-Plugin-Architecture"
     },
-    "github-buttons": {
-      "repo": "azu/JavaScript-Plugin-Architecture",
-      "types": [
-        "star"
-      ]
-    },
     "edit-link": {
       "base": "https://github.com/azu/JavaScript-Plugin-Architecture/edit/master/",
       "label": "Edit This Page"

package.json

@@ -49,7 +49,6 @@
     "gitbook-plugin-edit-link": "^2.0.0",
     "gitbook-plugin-ga": "^1.0.0",
     "gitbook-plugin-github": "^2.0.0",
-    "gitbook-plugin-github-buttons": "^2.0.0",
     "gitbook-plugin-include-codeblock": "^1.9.0",
     "gitbook-plugin-japanese-support": "0.0.1",
     "gitbook-plugin-richquotes": "0.0.7",