refactor: image handling logic + support for external images (#1235)

* refactor: simplify image partial logic, remove generation of different image sizes

* Remove `defaultImage.opengraph` configuration from `params.toml`.

layouts/_partials/article-list/compact.html

@@ -11,30 +11,12 @@
             </footer>
         </div>
 
-        {{- $image := partialCached "helper/image" (dict "Context" . "Type" "articleList") .RelPermalink "articleList" -}}
-        {{ if $image.exists }}
-            <div class="article-image">
-                {{ if $image.resource }}
-                    {{- $Permalink := $image.resource.RelPermalink -}}
-                    {{- $Width := $image.resource.Width -}}
-                    {{- $Height := $image.resource.Height -}}
-
-                    {{- if (default true .Page.Site.Params.imageProcessing.cover.enabled) -}}
-                        {{- $thumbnail := $image.resource.Fill "120x120" -}}
-                        {{- $Permalink = $thumbnail.RelPermalink -}}
-                        {{- $Width = $thumbnail.Width -}}
-                        {{- $Height = $thumbnail.Height -}}
-                    {{- end -}}
-                    
-                    <img src="{{ $Permalink }}" 
-                        width="{{ $Width }}"
-                        height="{{ $Height }}" 
-                        alt="{{ .Title }}"
-                        loading="lazy">
-                {{ else }}
-                    <img src="{{ $image.permalink }}" loading="lazy" alt="Featured image of post {{ .Title }}" />
-                {{ end }}
-            </div>
+        {{- $image := partial "helper/image" (dict "Image" .Params.image "Resources" .Resources) -}}
+        {{ if $image }}
+        <div class="article-image">
+            <img src="{{ $image.Permalink }}" width="{{ $image.Width }}" height="{{ $image.Height }}" alt="{{ .Title }}"
+                loading="lazy">
+        </div>
         {{ end }}
     </a>
 </article>