Add discounted tickets to gold and silver tiers

Author: hypha

src/components/sponsor-tiers/sponsor-tiers.astro

@@ -93,6 +93,8 @@ const tiers: SponsorTierProps[] = [
       "Booth in exhibit hall",
       "<strong>3</strong> conference tickets (€1500 value)",
       "<strong>3</strong> remote tickets (€450 value)",
+      "<strong>3</strong> conference voucher with 30% discount (€450 value)",
+
       "Video ad(s) (silent) on venue digital signage",
       "1 job posting on EuroPython blog",
       "<strong>5</strong> job postings on website",
@@ -113,6 +115,7 @@ const tiers: SponsorTierProps[] = [
       "Small booth in exhibit hall",
       "2 conference tickets (€1000 value)",
       "2 remote tickets (€300 value)",
+      "1 conference voucher with 30% discount (€150 value)",
       "Video ad(s) (silent) on venue digital signage",
       "1 job posting on EuroPython blog",
       "2 job postings on website",