remove the avatar on the header

_config.yml

@@ -11,12 +11,6 @@ title: flatline
 # TZ
 timezone: Asia/Tokyo
 
-# Link to avatar in the navbar (/assets/images/avatar.png). Leave empty if no logo desired. Two avatars for light and dark mode.
-# Avatar for light mode site
-lightavatar: /assets/images/light_flatline_logo.png
-# Avatar for dark mode site
-darkavatar: /assets/images/dark_flatline_logo.png
-
 # A short description (e.g., A blog dedicated to reviewing cat gifs), used as part of the title tag like Ben's Awesome Site | A blog dedicated to reviewing cat gifs instead of Ben's Awesome Site | Long description about a blog dedicated to reviewing cat gifs that would be used when page.title is not defined.
 tagline: FLATLINE 短歌
 

_includes/navigation.html

@@ -1,12 +1,6 @@
 <nav class="navbar navbar-expand-lg navbar-light">
   <div class="container-fluid">
     <a class="navbar-brand p-0" href="{{ '/' | relative_url }}">
-      {% if site.lightavatar or site.darkavatar %}
-      <img src="{{ site.lightavatar | relative_url }}" alt="light avatar" width="30"
-        class="d-inline-block align-top m-0 light-avatar">
-      <img src="{{ site.darkavatar | relative_url }}" alt="dark avatar" width="30"
-        class="d-inline-block align-top m-0 dark-avatar">
-      {% endif %}
       {{ site.name | upcase }}</a>
     <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarNav"
       aria-controls="navbarNav" aria-expanded="false" aria-label="Toggle navigation">