Polish landing copy, footer links, and buy button behavior.

Rewrite feature descriptions in narrative style, open buy links in a new tab, update support email, rename key action to Choose key, and remove privacy policy from the footer.

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

src/data/siteContent.ts

@@ -7,8 +7,7 @@ export const SITE_LINKS = {
   download: "#platforms",
   buy: "https://donate.stream/ttrpgplayer",
   enterKey: "#pricing",
-  support: "mailto:support@ttrpgplayer.example",
-  privacy: "#",
+  support: "mailto:fontosh.ivan@gmail.com",
 } as const;
 
 /** Same feed as electron-builder `publish.url` in dnd_player/package.json */