Improved sass compilation to use standard jekyll

Gemfile.lock

@@ -1,12 +1,10 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    addressable (2.5.2)
+    addressable (2.6.0)
       public_suffix (>= 2.0.2, < 4.0)
     colorator (1.1.0)
-    ffi (1.9.18)
-    ffi (1.9.18-x64-mingw32)
-    ffi (1.9.18-x86-mingw32)
+    ffi (1.11.1-x64-mingw32)
     forwardable-extended (2.6.0)
     jekyll (3.3.1)
       addressable (~> 2.4)
@@ -19,44 +17,44 @@ GEM
       pathutil (~> 0.9)
       rouge (~> 1.7)
       safe_yaml (~> 1.0)
-    jekyll-feed (0.9.2)
+    jekyll-feed (0.11.0)
       jekyll (~> 3.3)
-    jekyll-sass-converter (1.5.0)
+    jekyll-sass-converter (1.5.2)
       sass (~> 3.4)
-    jekyll-watch (1.5.0)
-      listen (~> 3.0, < 3.1)
-    kramdown (1.15.0)
+    jekyll-watch (1.5.1)
+      listen (~> 3.0)
+    kramdown (1.17.0)
     liquid (3.0.6)
-    listen (3.0.8)
+    listen (3.1.5)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
+      ruby_dep (~> 1.2)
     mercenary (0.3.6)
-    pathutil (0.16.0)
+    pathutil (0.16.2)
       forwardable-extended (~> 2.6)
-    public_suffix (3.0.1)
-    rb-fsevent (0.10.2)
-    rb-inotify (0.9.10)
-      ffi (>= 0.5.0, < 2)
+    public_suffix (3.1.1)
+    rb-fsevent (0.10.3)
+    rb-inotify (0.10.0)
+      ffi (~> 1.0)
     rouge (1.11.1)
-    safe_yaml (1.0.4)
-    sass (3.5.3)
+    ruby_dep (1.5.0)
+    safe_yaml (1.0.5)
+    sass (3.7.4)
       sass-listen (~> 4.0.0)
     sass-listen (4.0.0)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
 
 PLATFORMS
-  ruby
   x64-mingw32
-  x86-mingw32
 
 DEPENDENCIES
   jekyll (= 3.3.1)
   jekyll-feed (~> 0.6)
   sass
 
 RUBY VERSION
-   ruby 2.5.1p57
+   ruby 2.5.5p157
 
 BUNDLED WITH
-   1.16.3
+   2.0.2

_config.yml

@@ -28,7 +28,7 @@ twitter_username: ""
 google_analytics_id: 'UA-117297510-1'
 select_options: clear-filters HTML5 CSS3 SCSS javaScript jQuery materialize charts.js React jekyll Ruby-on-Rails Sinatra front-end back-end finished current
 sass:
-  sass_dir: assets/css/main.css
+  sass_dir: _sass
   style: :nested
 
 gems: