Use HTTPS (#247)

Otherwise the site is broken with the extension HTTPS Everywhere (trying to load http assets from https)

_config.yml

@@ -11,7 +11,7 @@ title                    : "Hain"
 title_separator          : "-"
 name                     : "Heejin Lee"
 description              : "An 'alt+space' launcher for Windows"
-url                      : "http://hainproject.github.io" # the base hostname & protocol for your site e.g. "https://mmistakes.github.io"
+url                      : "https://hainproject.github.io" # the base hostname & protocol for your site e.g. "https://mmistakes.github.io"
 baseurl                  : "/hain" # the subpath of your site, e.g. "/blog"
 repository               : "hainproject/hain" # GitHub username/repo-name e.g. "mmistakes/minimal-mistakes"
 teaser                   : # filename of teaser fallback teaser image placed in /images/, .e.g. "500x300.png"
@@ -254,4 +254,4 @@ defaults:
       share: false
       comments: false
       sidebar:
-        nav: "docs"
+        nav: "docs"