feat(cc-dark-theme): use sass instead of static css

In order to despaghettify the dark theme styles, this CL introduces Sass
compilation for the dark theme styles.

Bug: twpowertools:21
Change-Id: Ibbae3f85f355fab690f42f2bae9cf7766d9d43a3
diff --git a/src/contentScripts/communityConsole/start.js b/src/contentScripts/communityConsole/start.js
index 2bac9a3..a597aaa 100644
--- a/src/contentScripts/communityConsole/start.js
+++ b/src/contentScripts/communityConsole/start.js
@@ -68,11 +68,11 @@
     switch (options.ccdarktheme_mode) {
       case 'switch':
         if (options.ccdarktheme_switch_status == true)
-          injectStylesheet(chrome.runtime.getURL('css/ccdarktheme.css'));
+          injectStylesheet(chrome.runtime.getURL('ccDarkTheme.bundle.css'));
         break;
 
       case 'system':
-        injectStylesheet(chrome.runtime.getURL('css/ccdarktheme.css'), {
+        injectStylesheet(chrome.runtime.getURL('ccDarkTheme.bundle.css'), {
           'media': '(prefers-color-scheme: dark)',
         });
         break;