Optimize image qualities and a fix (#762)

* blog tag-list

* optimize publication preview

* better compression

* optimize jpg project images

* reduce sizes of project images

* fix

_config.yml

@@ -258,7 +258,7 @@ imagemagick:
     - ".png"
     - ".tiff"
   output_formats:
-    webp: "-quality 75%"
+    webp: "-resize 800x"
 
 # -----------------------------------------------------------------------------
 # Jekyll Diagrams

blog/index.html

@@ -22,7 +22,7 @@ pagination:
 
   {% if site.display_tags %}
   <div class="tag-list">
-    <ul class="list-group list-group-horizontal">
+    <ul class="p-0 m-0">
       {% for tag in site.display_tags %}
         <li>
           <i class="fas fa-hashtag fa-sm"></i> <a href="{{ tag | prepend: '/blog/tag/' | relative_url }}">{{ tag }}</a>