Refactor page titles and subtitles for consistency and clarity across various PDF conversion tools

src/pages/header-footer.html

@@ -120,11 +120,10 @@
           class="text-2xl font-bold text-white mb-2"
           data-i18n="tools:headerFooter.name"
         >
-          Header Footer Free Online - Fast & Secure
+          Header & Footer
         </h1>
         <p class="text-gray-400 mb-6" data-i18n="tools:headerFooter.subtitle">
-          Add customizable headers and footers to your PDF documents with
-          dynamic page numbers.
+          Add text to the top and bottom of pages.
         </p>
 
         <div