fix: disable contact form submit if email is not valid

src/pages/contact.tsx

@@ -186,7 +186,9 @@ Message: ${message}`
                 ></textarea>
               </div>
               <div className="mb-3">
-                <SolidButton theme="dark">Submit</SolidButton>
+                <SolidButton theme="dark" disabled={emailError}>
+                  Submit
+                </SolidButton>
               </div>
             </form>
             {notification && <span>{notification}</span>}