Series update - fix styling (#15275)

* Update meta description for Pulumi blog series page to reflect detailed content.

* Update highlight background color for current series and post to a lighter blue in sidebar templates.

Author: adamgordonbell

content/blog/series.md

@@ -1,7 +1,7 @@
 ---
 title: "Pulumi Blog: All series"
 layout: series
-meta_desc: A list of all Pulumi blog series, sorted alphabetically.
+meta_desc: A list of all Pulumi blog series including a description of each.
 ---
 
-All [Pulumi blog](/blog/) series, sorted alphabetically.
+All [Pulumi blog](/blog/) series.

layouts/partials/blog/series-list-sidebar.html

@@ -42,7 +42,7 @@ <h5 class="no-anchor text-lg font-semibold mb-4">All Blog Series</h5>
                         <li class="leading-snug">
                             {{ if eq .slug $currentTag }}
                                 <!-- Current series - highlighted -->
-                                <div class="bg-blue-50 border-l-4 border-blue-500 pl-3 py-2 rounded-r">
+                                <div class="bg-blue-100 border-l-4 border-blue-500 pl-3 py-2 rounded-r">
                                     <div class="text-sm font-semibold text-blue-900">{{ .title }}</div>
                                     <div class="text-xs text-blue-700 mt-1">{{ substr .description 0 50 }}{{ if gt (len .description) 50 }}...{{ end }}</div>
                                     <div class="text-xs text-blue-600 mt-1">Current series</div>

layouts/partials/blog/series-sidebar.html

@@ -70,7 +70,7 @@ <h5 class="no-anchor text-lg font-semibold mb-4">In This Series</h5>
                         <li class="leading-snug">
                             {{ if eq $post.RelPermalink $.Page.RelPermalink }}
                                 <!-- Current post - highlighted -->
-                                <div class="bg-blue-50 border-l-4 border-blue-500 pl-3 py-2 rounded-r">
+                                <div class="bg-blue-100 border-l-4 border-blue-500 pl-3 py-2 rounded-r">
                                     <div class="text-sm font-semibold text-blue-900">{{ $titleMainText }}</div>
                                     {{ if $titleSubText }}
                                         <div class="text-xs text-blue-700 mt-1">{{ $titleSubText }}</div>