refactor: drop support for hidden field in front matter

layouts/_default/archives.html

@@ -16,10 +16,8 @@
     </header>
 
     {{ $pages := where .Site.RegularPages "Type" "in" .Site.Params.mainSections }}
-    {{ $notHidden := where .Site.RegularPages "Params.hidden" "!=" true }}
-    {{ $filtered := ($pages | intersect $notHidden) }}
-
-    {{ range $filtered.GroupByDate "2006" }}
+    
+    {{ range $pages.GroupByDate "2006" }}
     {{ $id := lower (replace .Key " " "-") }}
     <div class="archives-group" id="{{ $id }}">
         <h2 class="archives-date section-title"><a href="{{ $.RelPermalink }}#{{ $id }}">{{ .Key }}</a></h2>

layouts/_default/rss.xml

@@ -6,7 +6,6 @@
 {{- else -}}
 {{- $pages = $pctx.Pages -}}
 {{- end -}}
-{{- $pages := where $pages "Params.hidden" "!=" true -}}
 {{- $limit := .Site.Config.Services.RSS.Limit -}}
 {{- if ge $limit 1 -}}
 {{- $pages = $pages | first $limit -}}