Added logo variable to _config.yml which can be set to a path/url

Automatically replaces the title with a logo

_config.yml

@@ -17,6 +17,7 @@ title: Just the Docs
 description: A Jekyll theme for documentation
 baseurl: "/just-the-docs" # the subpath of your site, e.g. /blog
 url: "https://pmarsceill.github.io" # the base hostname & protocol for your site, e.g. http://example.com
+#logo: "/assets/images/just-the-docs.png"
 
 permalink: pretty
 exclude: ["node_modules/", "*.gemspec", "*.gem", "Gemfile", "Gemfile.lock", "package.json", "package-lock.json",  "script/", "LICENSE.txt", "lib/", "bin/", "README.md", "Rakefile"]

_includes/title.html

-{{ site.title }}
\ No newline at end of file
+{% if site.logo %}
+  <div class="site-logo"></div>
+{% else %}
+  {{ site.title }}
+{% endif %}

_sass/layout.scss

@@ -153,6 +153,17 @@
   }
 }
 
+@if variable-exists(logo) {
+  .site-logo {
+    width: 100%;
+    height: 100%;
+    background-image: url($logo);
+    background-position: left center;
+    background-repeat: no-repeat;
+    background-size: contain;
+  }
+}
+
 .menu-button {
   appearance: none;
   display: flex;

assets/css/dark-mode-preview.scss

@@ -3,6 +3,10 @@
 # only Main files contain this front matter, not partials.
 ---
 
+{% if site.logo %}
+$logo: "{{ site.logo | absolute_url }}";
+{% endif %}
+
 //
 // Import external dependencies
 //

assets/css/just-the-docs.scss

@@ -3,6 +3,10 @@
 # only Main files contain this front matter, not partials.
 ---
 
+{% if site.logo %}
+$logo: "{{ site.logo | absolute_url }}";
+{% endif %}
+
 //
 // Import external dependencies
 //