add option to use dark/light logo for organization

config.yaml

@@ -23,7 +23,8 @@ params:
   logo:
     header: "/assets/images/logo.svg"
     footer: "/assets/images/logo.svg"
-
+  organizations:
+    dark_logo_background: false
   image_sizes:
     design_system:
       lightbox:

layouts/partials/blocks/templates/partners.html

 {{- $template := .block.template -}}
 {{- $position := .block.position -}}
 {{- $title := .block.title -}}
+{{ $logo_index := "logo" }}
+{{ if site.Params.organizations.dark_logo_background }}
+  {{ $logo_index = "logo_on_dark_background" }}
+{{ end }}
 {{- with .block.data -}}
   <section class="block block-partners{{ if $title }} block-with-title{{ end }}" id="block-{{ $position }}">
     <div class="container">
@@ -27,7 +31,7 @@
                 {{ template "partner" (dict 
                     "title" .Title
                     "url" .Permalink
-                    "logo"  .Params.logo
+                    "logo" (index .Params $logo_index)
                   )}}
               {{ end }}
             {{ else }}

layouts/partials/organizations/logo.html

 {{- if .Params.logo -}}
+  {{ $logo_index := "logo" }}
+  {{ if site.Params.organizations.dark_logo_background }}
+    {{ $logo_index = "logo_on_dark_background" }}
+  {{ end }}
   <figure class="logo">
     {{- partial "commons/image.html"
-          (dict
-            "image"    .Params.logo
-            "alt"      .Title
-            "sizes"    site.Params.image_sizes.sections.organizations.logo
-          ) -}}
+        (dict
+          "image"    (index .Params $logo_index)
+          "alt"      .Title
+          "sizes"    site.Params.image_sizes.sections.organizations.logo
+        ) -}}
   </figure>
 {{- end -}}

layouts/partials/organizations/organization.html

 <article class="organization">
   <div>
     {{ $title := partial "PrepareHTML" .Title }}
-    <h2><a href="{{ .Permalink }}" title="{{ safeHTML (i18n "commons.more_aria" (dict "Title" $title)) }}">{{ $title }}</a></h2>
+    <h2>
+      <a href="{{ .Permalink }}" title="{{ safeHTML (i18n "commons.more_aria" (dict "Title" $title)) }}">
+        {{ $title }}
+      </a>
+    </h2>
   </div>
   <div class="media">
     {{- if .Params.logo -}}
+    {{ $logo_index := "logo" }}
+    {{ if site.Params.organizations.dark_logo_background }}
+      {{ $logo_index = "logo_on_dark_background" }}
+    {{ end }}
       {{- partial "commons/image.html"
             (dict
-              "image"    .Params.logo
+              "image"    (index .Params  $logo_index)
               "alt"      $title
               "sizes"    site.Params.image_sizes.sections.organizations.item
             ) -}}