Use pregenerated favicons instead of jekyll-favicon plugin

Gemfile

@@ -13,7 +13,6 @@ gem 'stringex', '~> 2.8.5'
 
 group :jekyll_plugins do
   gem 'html-proofer', '~> 4.3.0'
-  gem 'jekyll-favicon', '~> 1.1.0'
   gem 'jekyll-feed', '~>0.17.0'
   gem 'jekyll-paginate-v2'
   gem 'jekyll-seo-tag', '~> 2.8.0'

_config.yml

@@ -24,9 +24,6 @@ instagram:
 development:
   limit_posts: 10
 
-incremental: true
-markdown: kramdown
-
 exclude:
   - README.md
   - Makefile
@@ -41,9 +38,6 @@ plugins:
   - jekyll-sitemap
   - jekyll-paginate-v2
 
-favicon:
-  source: /assets/favicon.svg
-
 collections:
   formulas:
     output: true

_includes/head.html

@@ -22,5 +22,9 @@
   <link href="//fonts.googleapis.com/css2?family=Inter:wght@200;300;400;600&family=Sofia&display=swap" rel="stylesheet">
   <link href="//maxcdn.bootstrapcdn.com/font-awesome/latest/css/font-awesome.min.css" rel="stylesheet">
 
-  {% favicon %}
+  <!-- Favicons -->
+  <link rel="icon" type="image/png" sizes="32x32" href="{{ "/assets/favicon-32x32.png" | relative_url }}">
+  <link rel="apple-touch-icon" sizes="180x180" href="{{ "/assets/apple-touch-icon.png" | relative_url }}">
+  <link rel="icon" type="image/png" sizes="192x192" href="{{ "/assets/android-chrome-192x192.png" | relative_url }}">
+  <link rel="icon" type="image/svg+xml" href="{{ "/assets/favicon.svg" | relative_url }}">
 </head>