Open buy buttons in CrowdRepublic crowdfunding modal.

Replace donate.stream links with a modal announcing the upcoming campaign on CrowdRepublic, with RU/EN copy and the old buy URL commented out.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/data/siteContent.ts

@@ -1,3 +1,5 @@
+export const CROWDFUNDING_URL = "https://crowdrepublic.ru/" as const;
+
 export const SITE_LINKS = {
   features: "#features",
   howItWorks: "#how-it-works",
@@ -5,7 +7,7 @@ export const SITE_LINKS = {
   pricing: "#pricing",
   faq: "#faq",
   download: "#platforms",
-  buy: "https://donate.stream/ttrpgplayer",
+  // buy: "https://donate.stream/ttrpgplayer",
   enterKey: "#pricing",
   support: "mailto:player.ttrpg@gmail.com",
 } as const;