Fix article header CSS (#1171)

Author: choldgraf

src/pydata_sphinx_theme/assets/styles/sections/_header-article.scss

@@ -1,10 +1,16 @@
-.bd-header-article__inner {
+.header-article__inner {
   min-height: var(--pst-header-article-height);
   display: flex;
-  align-items: center;
   padding: 0 0.5rem;
 
-  .bd-header-article__end {
+  .header-article-items__start,
+  .header-article-items__end {
+    display: flex;
+    align-items: start;
+    gap: 0.5rem;
+  }
+
+  .header-article-items__end {
     margin-left: auto;
   }
 }

src/pydata_sphinx_theme/theme/pydata_sphinx_theme/sections/header-article.html

@@ -1,4 +1,4 @@
-<div class="header-article-items header-article__section">
+<div class="header-article-items header-article__inner">
   {% if theme_article_header_start %}
     <div class="header-article-items__start">
       {% for item in theme_article_header_start %}