Add copy code button (#963)

* Add copy code button

* External package not needed

* Improve alignement

* Update button style + add feedback on click

Signed-off-by: hossainemruz <hossainemruz@gmail.com>

* Update dependencies

Signed-off-by: hossainemruz <hossainemruz@gmail.com>

---------

Signed-off-by: hossainemruz <hossainemruz@gmail.com>
Co-authored-by: Emruz Hossain <hossainemruz@gmail.com>

exampleSite/hugo.yaml

@@ -91,6 +91,9 @@ params:
   # Configure various features of this theme
   features:
 
+    # Enable dark theme
+    darkMode:
+    
     # [Deprecated] Enable dark theme
     # This is a deprecated setting, but has not been removed to maintain backward compatibility
     # If `theme` is set, the `darkMode` setting will be discarded.
@@ -285,6 +288,10 @@ params:
           # options doc: https://github.com/sampotts/plyr#options
           # fullscreen: true
     
+    # Enables copy code button
+    copyCodeButton:
+      enable: true
+
     # Enable reading time support in post cards and in post pages
     readingTime:
       enable: true