made alternate class a mixin and fixed some displays for alternate posts/pages without image

assets/sass/_theme/utils/blocks.sass

@@ -48,7 +48,7 @@
             aspect-ratio: unset
         @include media-breakpoint-up(desktop)
             width: columns(4)
-            &:not(:first-child)
+            &:not(:first-child, .without-image)
                 margin-top: -5%
             &:nth-child(odd)
                 margin-left: auto

layouts/partials/blocks/templates/pages/alternate.html

@@ -16,7 +16,7 @@
       {{ else }}
         {{ $image_class = "" }}
       {{ end }}
-      <article class="{{ $image_class }}">
+      <article class="{{ $image_class }} {{- if (not (isset .Params "image")) -}} without-image {{- end -}}">
         {{ $heading_tag.open }}
           <a href="{{- .Permalink -}}">
             {{- partial "PrepareHTML" .Title -}}

layouts/partials/posts/post.html

@@ -19,7 +19,7 @@
   {{- $direction = partial "GetImageDirection" .Params.image -}}
 {{ end }}
 
-<article class='post {{ if $alternate }}{{ $direction }} {{if not (modBool $index 2)}}left{{ else}}right{{end}}{{end}}' itemprop="blogPosts" itemscope itemtype="http://schema.org/BlogPosting">
+<article class='post {{ if $alternate }} {{- if (not (isset .Params "image")) -}} without-image {{- end -}}{{ $direction }} {{if not (modBool $index 2)}}left{{ else}}right{{end}}{{end}}' itemprop="blogPosts" itemscope itemtype="http://schema.org/BlogPosting">
   <div class="post-content">
     {{- $title := partial "PrepareHTML" .Title -}}