DEV-909 Jamboree Heading Styles Cleanup

Tianyi LIANGrequested to merge
tianyi/dev-909-jamboree-headings-cleanup into main

Jamboree 2025 design has different font-size series from Typography and previous Jamborees as well, which makes fonts in Figma confusing when building Jamboree pages. Rather than cleaning up the headings of all previous Jamborees and re-adapting the font size, it is more economical to create a new variant of 2025-?.

This MR mainly aims to replace the original <h[1-4] class="dont-style"> with <h[2-5]>

Edited by Tianyi LIANG

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