chore: automate update of docs site (#2371)

docs/css/c3.css

@@ -22,6 +22,10 @@
 .c3-chart-arc path {
   stroke: #fff; }
 
+.c3-chart-arc rect {
+  stroke: white;
+  stroke-width: 1; }
+
 .c3-chart-arc text {
   fill: #fff;
   font-size: 13px; }
@@ -151,7 +155,7 @@
 
 .c3-chart-arcs .c3-chart-arcs-background {
   fill: #e0e0e0;
-  stroke: none; }
+  stroke: #FFF; }
 
 .c3-chart-arcs .c3-chart-arcs-gauge-unit {
   fill: #000;

package.json

@@ -22,7 +22,8 @@
     "watch:docs": "bundle exec middleman",
     "test:only": "karma start karma.conf.js",
     "test": "npm run build && npm run lint && karma start karma.conf.js",
-    "dist": "npm run build",
+    "dist": "npm run build && npm run copy-to-docs",
+    "copy-to-docs": "cp c3.min.js docs/js/ && cp c3.css docs/css/",
     "codecov": "codecov"
   },
   "repository": {