Improve layout of key website sections and simplify subscription text

Adds a line break after the CTA button and shortens the newsletter subscription button text.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: d004b9e1-f9be-46e2-acda-f440ccd644a9
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/af8dabca-e746-4e53-9c29-d8d4d9cf30f5/83c8f763-fc28-4c2d-abb4-b7eeed34f6e9.jpg

client/src/components/home/cta-section.tsx

@@ -16,6 +16,7 @@ export function CTASection() {
             Book a Class
           </Link>
         </div>
+        <br />
       </div>
     </section>
   );

client/src/components/navigation/footer.tsx

@@ -120,7 +120,7 @@ export default function Footer() {
                     Subscribing...
                   </>
                 ) : (
-                  "Subscribe to Newsletter"
+                  "Subscribe"
                 )}
               </button>
             </form>