feat: HN 'Who is Hiring?' scraper via Algolia API

feat: custom sign-in and sign-up pages with branded layout

fix: icon/placeholder overlap in all inputs + sidebar shows user name

feat: promo code field on subscribe page

feat: introductory pricing — $11.99 offer, $19.99 struck through

feat: subscription page + Pro Plan sidebar link

fix: show Load more jobs only on the last page