refactor: Improve form styles and structure

This commit improves the form styles and structure in the `styles.scss` file. It includes changes to the headings (`h2`, `h3`, `h4`) to enhance their readability and spacing. Additionally, a new section for sessions is introduced with an improved layout and margin. These changes enhance the overall user experience and visual appeal of the form.

styles/styles.scss

@@ -491,9 +491,11 @@ header {
       display: flex;
       flex-direction: column;
       padding-left: 20px;
+      padding-top: 20px;
       @include respond-above(md) {
         flex-direction: row;
         padding-left: 0px;
+        padding-top: 0px;
       }
       align-items: baseline;
       justify-content: space-between;