refactor(Container): simplify container component and remove size prop

Remove size variants from Container component and set a default max-width
Update all instances where Container was used with size prop to use default

src/layouts/AboutLayout.astro

@@ -30,7 +30,7 @@ const lang = Astro.currentLocale as Lang || defaultLang;
   
   <!-- Main content with proper spacing for fixed header -->
   <div class="pt-16 sm:pt-20">
-    <Container client:load size="md" className="py-8 md:py-12">
+    <Container client:load className="py-8 md:py-12">
       <div class="max-w-7xl mx-auto">
         <div class="grid grid-cols-1 xl:grid-cols-4 gap-6 lg:gap-8">
           <!-- Main Content -->

src/layouts/BlogPostLayout.astro

@@ -42,7 +42,7 @@ const finalReadingTime = readTime ? parseInt(readTime.replace(/\D/g, '')) : unde
   
   <!-- Main content with proper spacing for fixed header -->
   <div class="pt-16 sm:pt-20">
-    <Container client:load size="md" className="py-6 sm:py-8">
+    <Container client:load className="py-6 sm:py-8">
       <div class="max-w-7xl mx-auto">
         <div class="grid grid-cols-1 xl:grid-cols-4 gap-6 lg:gap-8">
           <!-- Main Content -->

src/layouts/TaxonomyPageLayout.astro

@@ -54,7 +54,7 @@ const localizedText = getLocalizedText();
 ---
 
 <BlogLayout title={title} description={Astro.props.description}>
-  <Container client:load size="md" className="py-8">
+  <Container client:load className="py-8">
     <!-- Header Section - Centered at the top -->
     <div class="text-center mb-10">
       <h1 class="text-4xl font-bold mb-3">