fix category links with more than 1 word

_layouts/categories.html

@@ -7,7 +7,7 @@
 <div class="row listrecent"> 
 {% for category in site.categories %}     
 <div class="section-title col-md-12 mt-4">
-<h2 id="{{ category[0] | downcase }}">Category <span class="text-capitalize">{{ category[0] }}</span></h2>
+<h2 id="{{ category[0] | replace: " ","-" }}">Category <span class="text-capitalize">{{ category[0] }}</span></h2>
 </div> 
 {% assign pages_list = category[1] %}
 {% for post in pages_list %}

_layouts/post.html

@@ -65,7 +65,7 @@ <h1 class="posttitle">{{ page.title }}</h1>
                     {% assign sortedCategories = page.categories | sort %}
                     {% for category in sortedCategories %}
                     <li>                        
-                     <a class="smoothscroll" href="{{site.baseurl}}/categories.html#{{ category | downcase }}">{{ category }}</a>
+                     <a class="smoothscroll" href="{{site.baseurl}}/categories.html#{{ category | replace: " ","-" }}">{{ category }}</a>
                     </li>
                     {% endfor %}
 				</ul>

_posts/2018-01-12-is-intelligence-enough.md

@@ -2,7 +2,7 @@
 layout: post
 title:  "External Featured Image"
 author: sal
-categories: [ Jekyll, tutorial ]
+categories: [ Jekyll, tutorial, web development ]
 image: "https://images.unsplash.com/photo-1541544537156-7627a7a4aa1c?ixlib=rb-0.3.5&ixid=eyJhcHBfaWQiOjEyMDd9&s=a20c472bc23308e390c8ffae3dd90c60&auto=format&fit=crop&w=750&q=80"
 ---
 Education must also train one for quick, resolute and effective thinking. To think incisively and to think for one's self is very difficult.