fix: convert section H1 tags to H2 for proper heading hierarchy

Fixes #227

- Changed 'AboutCode Projects Overview' from H1 to H2
- Changed 'Supporters' from H1 to H2
- Ensures single H1 per page for WCAG 2.1 compliance
- Improves SEO by eliminating multiple H1 tags

Signed-off-by: Gyan Ranjan Panda <gyanranjanpanda@gmail.com>

Author: Gyan Ranjan Panda

website/src/components/HomepageContent/index.js

@@ -29,7 +29,7 @@ export default function HomepageContent() {
                     className={styles.sectionHeader}
                     style={{ marginBottom: '15px', marginTop: '15px' }}
                 >
-                    <h1>AboutCode Projects Overview</h1>
+                    <h2>AboutCode Projects Overview</h2>
                 </div>
 
                 <div className={styles.sectionIntro}>
@@ -44,7 +44,7 @@ export default function HomepageContent() {
                     className={styles.sectionHeader}
                     style={{ marginBottom: '15px', marginTop: '30px' }}
                 >
-                    <h1>Supporters</h1>
+                    <h2>Supporters</h2>
                 </div>
                 <div className={styles.sectionIntro}>
                     <Supporters />