Update to ELIXIR Toolkit Theme 3.1.1 (#336)

* move to latest version

* index btn update

_config.yml

@@ -4,7 +4,7 @@ title: Infectious Diseases Toolkit
 description: "Find tools and guidelines to help you access, analyse and share infectious disease data, and respond quickly to disease outbreaks."
 # Metadata description of the website
 
-remote_theme: ELIXIR-Belgium/elixir-toolkit-theme@3.0.0
+remote_theme: ELIXIR-Belgium/elixir-toolkit-theme@3.1.1
 
 gtag: G-TNT17YGXQ4
 

_sass/_custom_classes.scss

@@ -309,24 +309,3 @@ section#search-section {
     }
 }
 
-/*-----Accordion styles-----*/
-
-// Add a bottom border to the last accordion.
-a.info-collapse[aria-expanded="false"]:last-of-type, 
-a.info-collapse[aria-expanded="true"]:last-of-type + .show {
-    border-bottom: 1px solid $border-color;
-}
-
-// Remove border hover effect.
-.info-collapse:hover, .info-collapse[aria-expanded="true"] {
-    border-color: $border-color !important;
-}
-
-// Add hover effect to accordion header text.
-a.info-collapse h3 {
-    transition: color .2s ease-in-out;
-}
-
-a.info-collapse:hover h3 {
-    color: rgba($link-color, .8) !important;
-}

index.html

@@ -88,7 +88,7 @@ <h2>We welcome contributors!</h2>
         </section>
      </div>
     {%- if site.theme_variables.back_to_top or site.theme_variables.back_to_top == nil %}
-    <button id="back-to-top" class="btn btn-primary" type="button" aria-hidden="true" onclick="topFunction()">
+    <button id="back-to-top" class="btn btn-primary btn-sm rounded-pill" type="button" aria-hidden="true" onclick="topFunction()">
         <i class="fa-solid fa-arrow-up"></i>
     </button>
     {%- endif %}